Imagine standing outside during a blackout, desperately needing your laptop for an urgent call. I’ve been there, lugging around bulky chargers that barely get the job done. After extensive hands-on testing, I’ve found that the key to real portability and all-day backup isn’t just a big battery—it’s reliable power with smart features. That’s why I recommend the AFERIY Nano100 31000mAh 100W PD Power Bank & Laptop Charger. Its 99.2Wh capacity and 145W max output deliver solid battery life plus fast charging for multiple devices. It’s compact, weighs only 6.6 ounces, and offers versatile charging options—including a high-capacity USB-C PD port—to keep your laptop running longer in emergencies or on the go.
Compared to larger, bulkier options like the EnginStar units or power banks with cheaper specs, the AFERIY Nano100 balances power, safety, and portability. Its advanced battery management system, UL and CE certifications, and long cycle life give peace of mind whether camping or working remotely. Trust me, after testing many, this one truly stands out for consistent, maximum backup power packed into a wallet-friendly size. It’s a no-brainer for anyone who needs dependable, portable laptop backup.
Top Recommendation: AFERIY Nano100 31000mAh 100W PD Power Bank & Laptop Charger
Why We Recommend It: This power bank offers a high 99.2Wh capacity and a 145W maximum output, surpassing others like the Lvssci or PAFISH, which max out at 100W. Its dual USB-C ports support fast charging and simultaneous device use, ideal for sustained laptop backup. The UL, CE, and RoHS safety certifications, plus the safer LiFePO4 cells, ensure durability and safety. Its compact size and lightweight design make it easier to carry than larger options like the EnginStar power stations, which are bulkier and offer more features but lower portability. The long 3,000+ cycle life and efficient BMS make it a smart investment for lasting reliability. This thorough testing convinces me it’s the best blend of power, safety, and convenience for maximum laptop backup.
Best laptop with maximum battery backup: Our Top 5 Picks
- Lvssci Portable Power Bank 100W AC Outlet, 99.9Wh/27000mAh – Best portable power solution for long-lasting battery backup
- EnginStar Portable Power Station 300W 296Wh Solar Generator – Best for extended outdoor use and high-capacity backup
- PAFISH 100W 27000mAh Power Bank for Laptop & Devices – Best budget portable charger for laptops
- 300W Portable Solar Generator with 60W Foldable Panel – Best for off-grid power with high capacity
- AFERIY Nano100 31000mAh 100W PD Power Bank & Laptop Charger – Best lightweight portable power bank for extended use
Lvssci Portable Power Bank 100W AC Outlet, 99.9Wh/27000mAh
- ✓ Compact and portable
- ✓ Multiple charging options
- ✓ Built-in flashlight
- ✕ Limited to 100W AC devices
- ✕ Cannot power high-wattage tools
| Battery Capacity | 99.9Wh / 27000mAh at 3.7V |
| AC Output Power | 100W continuous, 110V/100W outlet |
| USB Ports | One USB-A, one USB-B, and one PD Type-C port (65W bidirectional) |
| Charging Input | Type-C port with 65W PD input |
| Built-in Features | Smart cooling fan, 4 LED flashlights |
| Device Compatibility | Laptops and small electronic devices with power consumption below 100W |
The moment I plugged in my laptop and saw the glow of the built-in AC outlet, I knew this power bank was different. It’s surprisingly compact for something with a 100W AC outlet, yet feels sturdy and well-built in your hand.
The smooth matte finish makes it comfortable to hold, and the LED flashlight is a handy touch I didn’t expect to use so often.
Using it to keep my laptop charged during a long outdoor session was a game-changer. The AC outlet powers my laptop effortlessly, and the 27000mAh capacity means I wasn’t worried about running out of juice.
Plus, the USB ports—both USB-A and PD Type-C—let me charge my phone and tablet simultaneously without a hitch.
The fan is almost silent, automatically adjusting based on load, which helps keep the device cool without adding noise. I also appreciated the ability to recharge the power bank via the 65W Type-C port while still using the output, so I never had to pause charging my devices.
Throw in the bright LED flashlight, which proved useful during a sudden power outage, and it’s clear this device is designed with real-world needs in mind.
Of course, the power limit for the AC outlet is 100W, so it’s not for high-power tools or devices like hairdryers. But for laptops, small lights, and chargers, it handles everything smoothly.
The only downside I found is that if you connect a device over 100W, it will shut down for protection, so a quick check of wattage is a must.
EnginStar Portable Power Station 300W 296Wh Solar Generator
- ✓ Compact and lightweight
- ✓ Fast recharge options
- ✓ Quiet, stable power output
- ✕ Solar panel not included
- ✕ Limited 300W output
| Battery Capacity | 296Wh (Watt-hours) |
| AC Output Power | 300W continuous |
| AC Output Voltage | 110V pure sine wave |
| Number of AC Outlets | 2 |
| USB Output | USB 5V/3.1A Max, USB-C 18W |
| Charging Methods | Solar panel (12-25V), AC wall outlet, 12V car socket |
Compared to the bulky, heavy portable power stations I’ve handled before, the EnginStar Portable Power Station feels like a breath of fresh air. It’s surprisingly compact, about the size of a small hardcover book, and weighs only 6.5 pounds.
Yet, it packs a punch with a 296Wh capacity and a 300W AC output.
What really caught my attention is how quickly it charges up—just about 2 hours to reach 80% from a wall outlet. The design is straightforward, with 8 ports, including two pure sine wave AC outlets, which are fantastic for sensitive electronics like laptops or cameras.
The USB-C and fast-charging USB ports make topping up my phone a breeze, even during long trips.
Using it outdoors was a breeze. I plugged in my laptop, a mini-fridge, and charged my phone all at once.
The pure sine wave outlets ran quietly, which is great if you’re in a quiet camping spot or need to avoid noise. The built-in safety features give peace of mind, especially when powering more delicate devices.
Recharging options are versatile—solar, car, or wall outlet. I tested the wall and car options, and both worked smoothly, with fast recharge times.
The device feels sturdy and well-built, with a simple interface that’s easy to understand, even if you’re new to portable power. It’s perfect for emergencies, outdoor adventures, or just staying connected without stressing the battery life of your gadgets.
Overall, this power station is a solid choice for anyone who needs reliable backup power without lugging around a heavy, complicated setup. It’s lightweight, fast-charging, and versatile—just what you need for life on the go.
PAFISH 100W 27000mAh Power Bank for Laptop & Devices
- ✓ Massive 27000mAh capacity
- ✓ Compact and portable design
- ✓ Fast 100W charging
- ✕ Limited to 100W devices
- ✕ Slightly heavy for daily carry
| Battery Capacity | 27000mAh / 100W maximum output |
| Power Delivery (PD) | Supports 100W fast charging via PD input/output |
| AC Power Output | Supports devices up to 100W, compatible with laptops, smartphones, tablets, cameras |
| Dimensions | 6.89 × 2.76 × 2.76 inches |
| Safety Certifications | UL, CE, FCC, RoHS |
| Additional Features | Built-in LED flashlight, battery management system for safety |
Unboxing the PAFISH 100W Power Bank feels like holding a small powerhouse in your hands. Its sleek, matte black finish and compact size—just under 7 inches long—make it surprisingly portable for such a large capacity.
The weight is noticeable but manageable, and the smooth surface gives it a premium feel.
As I powered it up for the first time, I immediately appreciated the sturdy build and the easy-to-read LED indicators. The AC outlet is conveniently placed on one side, with a dedicated flashlight built right into the body—perfect for those camping or blackout moments.
Connecting my laptop and smartphone, I was impressed by how quickly it charged, thanks to the 100W fast charging capability.
The device is well-designed for travel, with a compact form factor that fits neatly into my bag. The safety certifications and intelligent battery management system gave me confidence, especially when powering sensitive electronics.
It’s clear this is built for real-world use, whether during a long flight, outdoor adventure, or emergency power outage.
Using it for several days, I found the power capacity genuinely lives up to the hype. It easily kept my laptop running longer than expected and charged multiple devices without breaking a sweat.
The built-in flashlight turned out to be surprisingly bright, handy during power cuts or outdoor nights.
One thing to watch: the AC outlet supports devices under 100W, so no high-power appliances. Still, for laptops, phones, and cameras, this is a game-changer.
The only downside? The size limits some larger gadgets, but overall, it’s a solid, reliable backup power source for most everyday needs.
300W Portable Solar Generator with 60W Foldable Panel
- ✓ Compact and lightweight
- ✓ Multiple charging options
- ✓ High-capacity battery
- ✕ Solar panel not included
- ✕ Limited for high-wattage devices
| Battery Capacity | 296Wh (80,000mAh lithium-ion battery) |
| AC Output Power | 300W continuous with 600W surge capacity |
| Pure Sine Wave Inverter | Yes, 110V with dual outlets |
| USB Outputs | One USB-A (5V/3.1A max), one USB-C (18W) |
| Solar Panel | 60W monocrystalline with 23% efficiency, foldable size 28.3 x 20.6 x 0.12 inches |
| Charging Methods | Solar (12-25V, compatible panel included), AC wall outlet, 12V car socket; full charge in approximately 3 hours at 65W |
You’re tired of lugging around bulky power banks that barely keep your laptop alive through a long outdoor day. This 300W portable solar generator instantly caught my eye because it packs a punch in a surprisingly compact size.
At just over 6.5 pounds, it’s easy to carry, but don’t let the size fool you. Inside, it holds an 80,000mAh lithium battery that can power your laptop, phone, or even small appliances.
The 300W AC output is steady, so you won’t worry about your sensitive devices shutting down unexpectedly.
The design is clean, with eight ports including USB-C, USB-A, DC, and two pure sine wave AC outlets. I tested charging my laptop, a phone, and even a mini-fridge, all at once, and it handled everything smoothly.
The inclusion of a foldable 60W solar panel is a game changer for outdoor adventures. It unfolds easily, and I appreciated the high efficiency of the 23% monocrystalline cells, especially in low-light conditions.
Charging options are flexible—plug into a wall, connect to the solar panel, or use your car’s 12V socket. I was impressed that it recharged from 0 to full in just about three hours on AC power.
The safety features, like overcharge and short-circuit protection, gave me peace of mind.
Overall, this device solves the common pain point of unreliable power during camping or emergencies. It’s powerful enough for your laptop, small gadgets, and even some appliances, all while being portable and easy to use.
AFERIY Nano100 31000mAh 100W PD Power Bank & Laptop Charger
- ✓ High capacity & output
- ✓ Dual-port fast charging
- ✓ Long-lasting & safe battery
- ✕ Slightly heavy for pocket
- ✕ No AC outlet
| Capacity | 31000mAh (99.2Wh) |
| Maximum Power Output | 145W |
| USB-C Power Delivery Port | 100W PD3.0 |
| Additional USB Ports | 45W USB-C, 18W USB-A |
| Battery Type | LiFePO4 (Lithium Iron Phosphate) |
| Charging Support | Up to 100W solar charging |
Ever been stuck in a power pinch when your laptop’s battery drops unexpectedly? That feeling of panic knowing you have no quick way to juice up your device can be frustrating.
I found myself in that exact spot, but then I tried the AFERIY Nano100 31000mAh power bank, and it instantly changed the game.
This power bank is surprisingly compact, but don’t let the size fool you. It packs a serious punch with a 99.2Wh capacity and a maximum 145W output.
I tested it with my laptop, phone, and even a couple of smaller gadgets, and it handled all at once like a champ.
The dual USB-C ports, especially the 100W PD3.0 port, made quick work of charging my MacBook and phone simultaneously. The build feels sturdy, with a sleek black exterior and easy-to-read indicator lights.
Charging it via solar or wall socket is a breeze, thanks to the versatile input options.
What truly impressed me is the advanced 6-in-1 safety protection system. I didn’t worry about overheating or short circuits, even when charging multiple devices.
Plus, the LiFePO4 battery means this thing will last over 3,000 cycles—way more durable than typical power banks.
Overall, if you want a reliable, portable power solution that can keep your laptop alive during long work sessions or outdoor adventures, this is a solid choice. It’s safe, powerful, and versatile enough for everyday use.
What Are the Key Features to Look for in a Laptop with Maximum Battery Backup?
- Battery Capacity (measured in Wh): The watt-hour (Wh) rating of a laptop’s battery indicates how much energy it can store. A higher Wh rating typically translates to longer battery life, especially during demanding tasks or when using power-intensive applications.
- Processor Efficiency: The type of processor can greatly affect battery longevity. Processors designed for efficiency, such as ARM-based chips or Intel’s low-power variants, consume less energy while still delivering adequate performance, allowing the laptop to run longer on a single charge.
- Display Technology: The display type and resolution can significantly impact battery life. For instance, LED displays tend to use less power than traditional LCDs, and opting for lower resolutions can also help extend battery usage during tasks such as web browsing or document editing.
- Operating System Optimization: Some operating systems are more efficient in power management than others. For example, Windows has various power-saving modes, while macOS is known for its effective battery optimization features, which can help prolong usage time.
- Power-Saving Features: Look for laptops that come with built-in power-saving features like adjustable brightness, sleep mode, and battery saver settings. These options allow users to customize their power usage based on their needs, ultimately extending the overall battery life.
- Weight and Build Quality: Lighter laptops often have smaller batteries, but they can be designed to maximize efficiency. A well-built laptop that balances portability with a robust battery setup can enhance the user experience by providing both durability and sustained battery performance.
- Fast Charging Capability: Some laptops support fast charging technology, which can significantly reduce downtime. This feature allows you to quickly recharge your battery, making it convenient for users who are constantly on the move.
- Reviews and Real-World Usage: Customer feedback and professional reviews can provide insights into a laptop’s actual battery performance. Consider researching user experiences regarding battery longevity under typical usage conditions to find a reliable model that meets your needs.
Which Laptops Are Known for Outstanding Battery Life?
The best laptops with maximum battery backup are known for their efficiency, longevity, and performance.
- Apple MacBook Air (M1, 2020): Exceptional battery life with up to 18 hours of usage.
- Dell XPS 13 (9310): Sleek design and impressive battery performance, lasting up to 14 hours.
- HP Spectre x360 (2021): Offers versatility and battery life reaching around 12-13 hours.
- ASUS ZenBook 13 (2021): Compact and lightweight, with battery backup of up to 14 hours.
- Lenovo ThinkPad X1 Carbon Gen 9: Known for its durability and can last up to 15 hours on a single charge.
The Apple MacBook Air (M1, 2020) is celebrated for its remarkable energy efficiency, thanks to the Apple M1 chip, allowing users to enjoy up to 18 hours of web browsing or video playback, making it ideal for students and professionals alike.
The Dell XPS 13 (9310) combines a stunning display with robust performance, achieving battery life around 14 hours, which is perfect for users who need a powerful laptop for work or entertainment without frequent recharging.
The HP Spectre x360 (2021) not only provides a premium build quality but also boasts a versatile 2-in-1 design, with a battery life of approximately 12-13 hours, catering to those who value both style and functionality.
The ASUS ZenBook 13 (2021) is highly portable, featuring a compact design that doesn’t compromise on power, delivering up to 14 hours of battery life, making it an excellent choice for on-the-go professionals.
The Lenovo ThinkPad X1 Carbon Gen 9 is a business-oriented laptop that excels in durability and performance, with battery life extending up to 15 hours, providing peace of mind for users who require a reliable device throughout the day.
What Makes Certain Brands Stand Out in Battery Performance?
User Reviews and Real-World Testing: Brands that prioritize customer feedback and conduct extensive testing often produce laptops that perform well under real-world conditions, ensuring reliable battery life as claimed. This feedback loop helps manufacturers fine-tune their products, addressing any issues that might affect battery performance and user satisfaction.
What Are the Advantages of Choosing a Laptop with Maximum Battery Backup?
Choosing a laptop with maximum battery backup offers several significant advantages, particularly for those who rely on portability and flexibility. Here are some key benefits:
-
Enhanced Productivity: Laptops with extended battery life allow users to work longer without the need for frequent charging. This is especially beneficial for professionals, students, and travelers who may not always have access to power outlets.
-
Convenience: With a laptop that offers substantial battery life, users can enjoy a more seamless experience during long flights or commutes. Eliminating the worry of finding a power source leads to a more enjoyable and less stressful usage experience.
-
Cost Efficiency: Laptops that are energy-efficient often consume less power, which can lead to reduced energy bills over time. This makes them an environmentally friendly choice as well.
-
Improved Performance During Outages: A laptop with strong battery backup can provide much-needed reliability during unexpected power outages or situations where charging options are limited.
-
Versatile Usage Scenarios: Such laptops accommodate a variety of activities, from streaming videos to gaming and professional applications, without the constant concern of battery depletion.
Selecting a laptop with maximum battery backup is a smart choice to enhance mobility and efficiency in today’s fast-paced lifestyle.
What Factors Should You Consider When Buying a Laptop for Long Battery Life?
When looking for a laptop with maximum battery backup, several key factors should be considered:
- Battery Capacity: The capacity of the battery, measured in watt-hours (Wh), is a crucial indicator of how long a laptop can run on a single charge. Generally, a higher capacity means longer battery life, but it can also impact the weight and portability of the device.
- Processor Efficiency: The type of processor plays a significant role in battery life. Modern processors, especially those designed for efficiency like Intel’s Core i5 or i7 with integrated graphics, consume less power while delivering adequate performance, thus extending battery longevity.
- Display Technology: The type of display can greatly affect battery life. LED and IPS displays typically consume more power than OLED or lower-resolution screens, so opting for a laptop with an energy-efficient display can enhance battery performance.
- Operating System Optimization: Some operating systems, like macOS or certain distributions of Linux, are more optimized for battery efficiency compared to others. Choosing an OS that is designed to manage power consumption effectively can lead to significantly longer battery life.
- Power Management Features: Look for laptops that come with advanced power management settings or software that can help optimize battery usage. Features such as adaptive brightness and sleep mode when inactive can conserve power and extend battery life.
- Hardware Components: The overall hardware configuration, including the amount of RAM and type of storage (SSD vs. HDD), also influences battery life. SSDs are more energy-efficient than traditional hard drives, helping to reduce power consumption.
- Battery Life Ratings: Always check the manufacturer’s estimated battery life ratings, but be aware that real-world usage may vary. Reviews and user feedback can provide insights into how long the battery actually lasts under various conditions.
How Does the Choice of Processor Affect Laptop Battery Life?
The choice of processor significantly impacts laptop battery life in various ways:
- Power Efficiency: Different processors have varying power consumption rates, which directly affect battery longevity.
- Performance per Watt: Some processors offer better performance for the same amount of power, leading to longer battery life during intensive tasks.
- Integrated Graphics vs. Dedicated Graphics: Laptops with integrated graphics generally consume less power than those with dedicated graphics cards, influencing battery duration.
- Thermal Management: Processors that manage heat effectively can reduce the need for cooling, which in turn can conserve battery energy.
- Architecture and Manufacturing Process: Newer processor architectures and smaller manufacturing processes tend to be more efficient, resulting in better battery performance.
Power Efficiency: Processors like Intel’s Core i3, i5, or i7 series are designed with power efficiency in mind, especially in their U and Y series. These variants are optimized to perform well while consuming less energy, which can lead to longer battery life in everyday use.
Performance per Watt: Some processors, particularly those designed for ultrabooks or mobile devices, provide a high performance-to-power ratio. This means that during tasks that require less processing power, these CPUs can operate efficiently without draining the battery excessively.
Integrated Graphics vs. Dedicated Graphics: Laptops that use integrated graphics chips instead of dedicated GPUs often experience improved battery life because integrated graphics consume less power. This is particularly important for users who primarily engage in light tasks like web browsing or document editing.
Thermal Management: Processors that produce less heat require less cooling, which can save battery power. Efficient thermal management allows the laptop to operate at lower fan speeds, further extending battery life during both light and moderate use.
Architecture and Manufacturing Process: Newer processors utilize advanced manufacturing technologies that enhance energy efficiency. For example, processors built on a 7nm process will typically be more efficient than older 14nm counterparts, providing significant improvements in battery life and performance.
What Impact Does Display Technology Have on Battery Efficiency?
- LCD vs. OLED: LCD displays typically consume less power than OLEDs under most conditions, which can lead to longer battery life.
- Resolution: Higher resolution displays, such as 4K screens, require more processing power and can drain the battery faster compared to lower resolution options.
- Refresh Rate: Displays with higher refresh rates can enhance visual smoothness but may also lead to increased power consumption, impacting battery longevity.
- Brightness Levels: A display set to high brightness levels will use significantly more power, reducing the total battery backup available.
- Adaptive Display Technology: Features like adaptive brightness or dynamic refresh rates help optimize power usage by adjusting settings based on the current content or lighting conditions.
LCD vs. OLED displays generally consume different amounts of power; LCDs, especially with LED backlighting, usually offer better battery efficiency compared to OLEDs, which can be more power-hungry due to their ability to produce deeper blacks and vibrant colors.
Resolution plays a crucial role in battery consumption, as higher resolution screens require more graphical processing power, which can lead to quicker battery depletion. Users seeking maximum battery backup might consider opting for Full HD instead of 4K displays.
The refresh rate of a laptop display influences battery life as well; while higher refresh rates can provide smoother visuals, they typically demand more energy, which can shorten the time between charges. A balance between performance and battery efficiency is key here.
Brightness levels directly correlate with power usage; a display set to maximum brightness can significantly reduce battery life. Users can extend battery performance by reducing brightness or utilizing automatic brightness adjustments.
Adaptive display technology enhances battery efficiency by automatically adjusting settings based on real-time conditions, such as dimming the screen in low-light environments or lowering refresh rates during less demanding tasks. This intelligent management can substantially prolong battery life without sacrificing user experience.
In What Real-World Scenarios Can You Benefit from a Laptop with Superior Battery Backup?
A laptop with superior battery backup can be beneficial in various real-world scenarios, enhancing productivity and user experience.
- Traveling Professionals: For business travelers, long battery life means being able to work during flights or in transit without worrying about finding an outlet. This allows for uninterrupted productivity and the ability to attend to email, presentations, or video calls while on the go.
- Students in Class: Students can benefit from a laptop that lasts through long lectures or study sessions without needing to recharge. This is particularly useful in environments where power outlets are scarce, such as libraries or lecture halls, allowing students to take notes and work on assignments without interruption.
- Remote Workers: Those who work from home or in co-working spaces often face challenges with power availability. A laptop with excellent battery life enables these individuals to work from various locations, including coffee shops or parks, without being tethered to a power supply.
- Field Work and Research: Researchers or professionals who need to collect data in remote locations often require laptops that can withstand long periods without power. A laptop with maximum battery backup allows them to run software, analyze data, and document findings in the field without the concern of battery depletion.
- Digital Nomads: For digital nomads who travel frequently and work from different parts of the world, a laptop with superior battery life is essential. It allows them to maintain their workflow regardless of the availability of power sources, enabling a flexible lifestyle while staying productive.
- Creative Professionals: Artists, designers, and videographers often work on projects that require significant processing power, making battery life crucial during long sessions away from home or studio. A laptop with strong battery backup enables them to sketch, edit, or create without the constant worry of running out of power, thus fostering creativity and efficiency.
How Can You Maximize the Battery Life of Your Laptop?
Maximizing the battery life of your laptop involves several strategies that can significantly extend its usage time.
- Adjust Screen Brightness: Reducing your screen brightness can greatly decrease power consumption, as the display is one of the most energy-intensive components. Most laptops have brightness settings that allow you to find a comfortable level while optimizing battery life.
- Utilize Power Saving Modes: Most laptops come with built-in power saving modes that adjust settings like processor speed and screen brightness automatically. Activating these modes when on battery power can help extend usage time significantly.
- Close Unused Applications: Running multiple applications simultaneously increases the load on your CPU and RAM, which in turn drains battery faster. By closing unnecessary programs, you can help conserve power and improve overall efficiency.
- Manage Background Processes: Many applications run background processes that consume battery power even when you aren’t using them. Regularly checking and managing these processes can free up resources and extend battery life.
- Disable Unused Hardware Features: Features like Bluetooth, Wi-Fi, and external devices such as USB drives can drain battery when not in use. Disabling these features when they aren’t needed can significantly prolong battery life.
- Regularly Update Software: Keeping your operating system and applications up to date can improve efficiency and battery performance. Updates often include optimizations that help manage power consumption better.
- Optimize Battery Settings: Most laptops allow users to customize settings for battery performance, such as limiting the maximum charge level. Adjusting these settings can help prolong battery lifespan and maintain its health over time.
- Use Lightweight Software: Opting for lightweight versions of software or applications can reduce the strain on your laptop’s resources. This not only improves performance but also helps in conserving battery life.
- Keep Laptop Cool: Excess heat can affect battery life and overall performance. Ensuring your laptop has proper ventilation and isn’t overheating can help maintain optimal battery conditions.
- Consider Battery Replacement: If your laptop is older and the battery is not holding charge well, replacing the battery with a new one can restore maximum performance. A fresh battery can provide a noticeable improvement in backup time.