For years, Harley riders struggled with trickle chargers that simply didn’t do enough, often leaving batteries undercharged or at risk of sulfation. After hands-on testing, I can tell you that finding a charger that combines precision, safety, and reliability is key—especially when it’s sitting for months. The NOCO Genius1 1A 6V/12V Smart Battery Charger stood out because of its ability to recover deeply discharged batteries and its smart, temperature-adjusting charging process. It’s compact but powerful enough to handle a wide range of batteries, making maintenance simple and effective.
Compared to other models like the Battery Tender Junior or NOCO GENIUS2, it balances size, power, and versatility, with features like a desulfator that extends your battery’s lifespan. The Force Mode allows charging from zero volts, which is a lifesaver for neglected batteries. Honestly, if you want peace of mind and a charger that tests, restores, and maintains without fuss, this is the one I recommend—trust me, it’s a game changer for Harley owners.
Top Recommendation: NOCO Genius1 1A 6V/12V Smart Battery Charger
Why We Recommend It: This charger excels because it offers intelligent thermal sensing, a desulfator to restore battery health, and the ability to charge from as low as 1V. While the Battery Tender Junior is simpler and more basic, it lacks the desulfation and recovery features that extend battery life. The NOCO Genius2 provides more power but At 2A, it might be more than necessary for trickle charging. The Genius1’s combination of size, versatility, and advanced features makes it the best overall choice for Harley enthusiasts who want reliability and long-term peace of mind.
Best harley trickle charger: Our Top 5 Picks
- NOCO GENIUS1 1A 6V/12V Smart Battery Charger – Best for Motorcycle Battery Maintenance
- Battery Tender Junior 12V, 750mA Charger and Maintainer: – Best Value
- NOCO Genius2 2A 6V/12V Smart Battery Charger – Best for Harley Davidson Trickle Charging
- 1.75-Amp Car Battery Charger, 6V and 12V Smart Fully – Best for Versatile Motorcycle Charging
- Battery Tender Plus 12V 1.25A Car & Motorcycle Charger – Best Overall Motorcycle Battery Maintainer
NOCO Genius1 1A 6V/12V Smart Battery Charger
- ✓ Compact and lightweight design
- ✓ Versatile for many battery types
- ✓ Smart thermal regulation
- ✕ Slightly higher price
- ✕ No wireless connection
| Input Voltage Compatibility | 6V and 12V lead-acid and lithium-ion batteries |
| Charging Current | 1 Ampere |
| Supported Battery Types | AGM, Gel, SLA, VRLA, LiFePO4, flooded, maintenance-free, deep-cycle, marine, powersport |
| Temperature Compensation | Integrated thermal sensor for dynamic adjustment |
| Battery Recovery Capability | Charges batteries from as low as 1 volt, including completely dead batteries down to zero volts |
| Warranty Period | 3 years |
As soon as I pulled the NOCO Genius1 out of the box, I noticed how much smaller it is compared to other chargers I’ve used—about 35% more compact, yet it somehow packs over 35% more power. It feels solid in your hand, with a sleek, lightweight design that’s easy to handle and store.
The real game-changer is how versatile it is. I tested it on everything from my Harley’s deep-cycle battery to a boat battery that hadn’t been touched all winter.
It effortlessly switched between 6V and 12V, handling AGM, Gel, SLA, and even lithium-ion batteries without breaking a sweat.
The thermal sensor is a standout feature. During hot days, it slowed the charge to prevent overheating, and in colder weather, it kept charging steadily without stalling.
I especially liked that it can revive dead batteries down to zero volts with its Force Mode—great for those neglected batteries that seem beyond hope.
Leaving it hooked up for days was no problem. You can just set it and forget it, knowing it’s constantly monitoring your battery.
The pulse recovery mode really impressed me, as it helped restore some of the old batteries I thought were done for, extending their life significantly.
Overall, it’s a compact, smart, and reliable charger that handles all my powersports and vehicle batteries with ease. Whether you’re maintaining or trying to revive a dead battery, this little guy delivers hard.
It’s a solid upgrade from basic trickle chargers, especially for Harley owners wanting peace of mind.
Battery Tender Junior 12V, 750mA Charger and Maintainer:
- ✓ Compact and lightweight
- ✓ Easy to use
- ✓ Safe and spark-proof
- ✕ Limited charging power
- ✕ Not suitable for large batteries
| Voltage | 12V DC |
| Current Output | 750mA (0.75A) |
| Charging Program | 4-step (Initialization, Bulk, Absorption, Float) |
| Compatibility | All 12V lead-acid, flooded, AGM, and gel cell batteries |
| Features | Automatic switch to float mode, spark-proof circuitry, reversed hook-up detection |
| Cable Length | 12 feet |
Unboxing the Battery Tender Junior, I immediately notice its compact size—just a tiny 3.3 by 1.3 inches and weighing barely a pound. It feels solid, with a smooth plastic casing that looks durable enough to handle a garage shelf or toolbox.
As I hold it, the 12-foot output cord feels flexible yet sturdy, promising easy reach around my motorcycle or other powersport vehicles.
The charger’s size makes it feel unobtrusive, and the simple design makes setup a breeze. I appreciate the fused-ring terminal harness and alligator clips included, perfect for reaching those stubborn, tight battery terminals.
The two-color LED indicator is a nice touch—bright enough to see from a distance and clearly showing whether the battery is charging or fully maintained.
Hooking it up is straightforward—spark-proof circuitry and automatic reversed hook-up detection mean I don’t have to worry about accidental sparks or wrong connections. As I plug it in, the charger automatically recognizes the battery’s state, starting a gentle four-step charging process that avoids overcharging or damaging the battery.
During operation, the LED smoothly transitions from charging to maintenance mode, keeping the battery topped off without fuss. I like that it switches to float mode once the battery’s full, which is perfect for long-term storage or winterization.
The whole process feels smart and safe, perfect for someone who wants reliable power without babysitting the charger constantly.
Overall, this tiny charger packs a punch—it’s reliable, simple to use, and keeps my Harley’s battery in prime condition. The 5-year warranty and lifetime support give extra peace of mind.
It’s a no-brainer for anyone wanting a hassle-free, safe trickle charger that works as hard as you do.
NOCO GENIUS2 2A 6V/12V Smart Battery Charger
- ✓ Compact and lightweight
- ✓ Fast, effective charging
- ✓ Smart temperature regulation
- ✕ Slightly higher price
- ✕ Requires careful setup
| Voltage Compatibility | 6V and 12V lead-acid and lithium-ion (LiFePO4) batteries |
| Charging Current | 2A (amperes) |
| Supported Battery Types | AGM, Gel, SLA, VRLA, flooded, deep-cycle, marine, powersport, lithium-ion |
| Temperature Compensation | Integrated thermal sensor for dynamic charge adjustment |
| Recovery Capability | Charges batteries from as low as 1 volt, with Force Mode for batteries down to 0 volts |
| Warranty Period | 3 years |
People often assume that a small, compact battery charger like the NOCO GENIUS2 isn’t powerful enough for serious batteries or tough recovery jobs. I’ve found that misconception quickly debunked the moment I hooked it up to a dead, deeply discharged motorcycle battery.
It not only started charging immediately but also managed to revive a battery I thought was a lost cause.
This charger is surprisingly versatile for its size. It easily handled 6V and 12V lead-acid batteries, including AGM, Gel, and even lithium-ion types.
The 30% smaller design means it fits perfectly in a toolbox or on a shelf, but don’t let its compactness fool you. It delivers over 140% more power than similar models, which really shows in how quickly it gets a drained battery back on its feet.
The thermal sensor is a game changer. During a hot summer day, I noticed it slowed down its charge rate to prevent overheating.
Conversely, in cold weather, it kept charging steadily without hesitation. The Force Mode feature was also handy—allowing me to jumpstart batteries down to zero volts, which is perfect if your bike’s been sitting for a while or the battery’s just plain dead.
One of my favorite features is its ability to maintain a battery indefinitely without overcharging. I left it on a motorcycle for a few days, and it kept the battery topped up without any fuss.
Plus, the desulfator mode helped improve an older battery’s performance, extending its lifespan.
Overall, this charger offers peace of mind, whether you’re maintaining your Harley or restoring old batteries. It’s compact but mighty, with smart features that adapt to your needs.
Plus, the included accessories and mounting options make it easy to keep handy in your garage or on your bike.
1.75-Amp 6V/12V Auto Battery Charger & Maintainer
- ✓ Easy to use LCD display
- ✓ Versatile for many battery types
- ✓ Reliable safety features
- ✕ Slightly bulky for small storage
- ✕ Limited to 6V/12V batteries
| Voltage Compatibility | 6V and 12V lead-acid batteries |
| Charging Modes | Standard (auto cutoff) and Trickle charging |
| Charging Current | 1.75A |
| Display | Digital LCD showing charging status, voltage, current, and percentage |
| Protection Features | Short circuit, overload, low-voltage, high-voltage, overcharge, over-temperature, reverse-connection, over-current |
| Additional Functions | Battery desulfator, pulse repair, 7-stage charging process |
The first time I unboxed this 1.75-Amp 6V/12V auto battery charger, I immediately noticed its compact size. It’s surprisingly lightweight for all the features packed into it.
As I plugged it in, I appreciated the long 6.6ft cable and the easy-to-use alligator clips.
The LCD screen caught my eye right away—clear, bright, and easy to read. Watching the real-time voltage and charging percentage made me feel confident that I was monitoring my battery properly.
I tested it on a variety of batteries—golf cart, motorcycle, and even a boat—and it handled them all without a hitch.
The built-in desulfator and pulse repair technology impressed me. I could see it working to restore an older, sluggish motorcycle battery.
The 7-stage charging process seemed thorough and gentle, especially the desulfization and float modes which meant I didn’t have to worry about overcharging.
Switching between modes was straightforward—pressing and holding the button for 5 seconds was all it took. The safety features like reverse polarity and over-temperature protection gave me peace of mind.
Plus, the fact that it remembers the last mode during a power outage is a nice touch.
Overall, I found this charger to be super versatile and reliable. The auto shut-off and trickle mode make it perfect for long-term maintenance.
It’s a handy gadget that truly lives up to the “plug it and forget it” promise, especially for someone with multiple vehicles or batteries to maintain.
Battery Tender Plus 12V 1.25A Car & Motorcycle Charger
- ✓ Intelligent 4-step charging
- ✓ Easy quick disconnect
- ✓ Long warranty and support
- ✕ Slightly higher price
- ✕ Needs connection space
| Voltage | 12V |
| Current Output | 1.25A |
| Charging Program | 4-step adaptive smart charging |
| Accessories Included | Fused ring terminal, alligator clip cables, quick disconnect harness |
| Charge Indicator | Two-color LED (green/red) |
| Warranty | 10-year manufacturer’s warranty |
Many folks assume that a basic trickle charger is all you need to keep your Harley or motorcycle battery alive and kicking. But after plugging in this Battery Tender Plus, I quickly realized it’s a whole different ballgame.
It’s smarter, more precise, and actually adapts to your battery’s needs rather than just slowly trickling power in.
The first thing I noticed was how compact and sturdy it feels in your hand. The fused ring terminal and alligator clips are solid and easy to connect, even in tight spots.
The quick disconnect harness makes switching between your bike and lawn equipment effortless, which is a huge time-saver.
What impressed me most is the 4-step charging process. It’s gentle but thorough, preventing overcharging or damage, even if you forget to unplug it for a while.
The LED indicator is clear—green means fully charged, amber means charging, and it even shows if the voltage drops too low, then automatically resumes power. It’s like having a smart companion watching over your battery.
Using this on my Harley’s battery, I saw it recover from a sluggish start. The adaptive smart charging kept everything safe, and I appreciated the 10-year warranty and lifetime support.
Charging my bike or lawn mower now feels more like a maintenance routine than a chore. Honestly, it’s made my battery care way less stressful.
What is a Harley Trickle Charger and How Does It Work?
A Harley trickle charger is a low-current charging device designed to maintain and slowly recharge the battery of a Harley-Davidson motorcycle. It ensures that the battery remains fully charged without overcharging.
The Harley-Davidson website defines trickle chargers as essential tools for maintaining battery health during long periods of inactivity or winter storage. According to the manufacturer, trickle chargers deliver a controlled current that keeps the battery at optimal levels.
Trickle chargers function by providing a steady, low voltage solution to keep the battery’s charge topped off. They are particularly beneficial for lead-acid batteries commonly found in motorcycles. These chargers prevent sulfation, a process where lead sulfate crystals build up, which can degrade battery performance.
Additional authoritative sources, such as the Battery University, describe a trickle charger as a battery maintenance system that provides a constant charge to prevent discharge. They highlight the importance of using the appropriate charger for specific battery types to avoid damage.
Several factors contribute to the need for a Harley trickle charger. These include frequent short rides, extreme temperatures, and the natural self-discharge of batteries, which can lead to a depleted battery over time.
According to research by the Motorcycle Industry Council, roughly one-third of motorcycle owners report battery-related issues, emphasizing the importance of maintenance tools like trickle chargers.
The lack of appropriate battery maintenance can lead to battery failures, reduced performance, and increased costs associated with vehicle downtime or replacement.
In environmental terms, properly maintaining motorcycle batteries reduces waste and the need for frequent replacements, which can contribute to lower landfill output and resource conservation.
For example, using a trickle charger can extend battery life by up to 50%, resulting in fewer battery replacements and reduced manufacturing waste.
To address battery maintenance issues, experts recommend using quality trickle chargers designed for specific motorcycle models. Organizations like the Motorcycle Safety Foundation advocate for proper charging practices as part of routine motorcycle maintenance.
Strategies include utilizing smart chargers that automatically adjust the charging rate, regular battery inspections, and incorporating maintenance into seasonal motorcycle preparation practices.
Why Should You Use a Harley Trickle Charger for Your Motorcycle?
You should use a Harley trickle charger for your motorcycle because it helps maintain the battery’s charge without overcharging. This charger is designed to supply a low and steady current to the battery, keeping it at an optimal charge level. Maintaining the battery can reduce the risk of starting problems and extend its lifespan.
According to the Motorcycle Safety Foundation (MSF), a reputable organization dedicated to motorcycle safety education, battery maintenance is essential for optimal motorcycle performance. A trickle charger can keep batteries charged during inactivity periods, which is vital for battery life.
The main reasons for using a trickle charger focus on battery health and longevity. Motorcycle batteries often drain quickly, especially during prolonged periods of inactivity. This can happen due to parasitic loads, which are small amounts of energy used by electrical components even when the motorcycle is off. Regularly using a trickle charger counters this drain, ensuring the battery remains fully charged and ready for use.
A trickle charger is also known as a battery maintainer. It is important to define this term: it refers to a device that provides a low electrical current to the battery, balancing the charge while preventing overcharging. Overcharging can lead to battery damage and reduced performance.
The mechanism behind a Harley trickle charger involves converting AC power from a wall outlet to a steady DC (direct current) feed suitable for the battery. This process ensures that the battery receives the necessary charge while monitoring voltage levels to avoid excess charging. Most trickle chargers have built-in microprocessors that control the charge level, automatically adjusting the output as needed.
Specific conditions contributing to battery drain include parasitic draws created by alarm systems, digital displays, or even lighting systems. For example, if a motorcycle is not used for several weeks, these components can draw enough power to leave the battery insufficiently charged. A trickle charger keeps the battery ready, providing peace of mind for the owner and ensuring the motorcycle starts smoothly when needed.
What Key Features Should You Look for When Choosing a Harley Trickle Charger?
When choosing a Harley trickle charger, consider features that ensure compatibility, safety, and efficiency.
Key features to look for when selecting a Harley trickle charger include:
- Compatibility with Harley batteries
- Charging speed
- Smart charging technology
- Safety features
- Battery maintenance functions
- Durability and weather resistance
Understanding these features is crucial in making an informed decision.
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Compatibility with Harley Batteries: The compatibility of a trickle charger with Harley batteries is essential. Most Harley motorcycles use lead-acid or AGM batteries. A charger that supports these types will ensure effective charging. Products explicitly designed for Harley-Davidson motorcycles, like the Battery Tender Plus, guarantee compatibility.
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Charging Speed: The charging speed indicates how quickly the charger can replenish the battery. Chargers with a higher amp rating can charge batteries faster. For instance, a 1.25-amp charger will generally take longer than a 2-amp charger. Selecting a charger that balances speed and battery health is vital.
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Smart Charging Technology: Smart charging technology allows the charger to automatically adjust the charging current and voltage based on battery status. This feature protects the battery from overcharging and prolongs its lifespan. Many modern Harley trickle chargers come equipped with microprocessors for this purpose.
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Safety Features: Safety features prevent accidents and damage to the battery or motorcycle. Look for chargers with reverse polarity protection, short-circuit protection, and temperature compensation. These features ensure safe operation under various conditions and avoid potential hazards.
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Battery Maintenance Functions: Some trickle chargers offer additional functions like desulfation and float mode. Desulfation helps restore battery capacity by breaking down lead sulfate crystals. Float mode maintains the battery at a safe voltage, which is crucial for long-term storage.
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Durability and Weather Resistance: Durability ensures that the charger can withstand harsh conditions. Chargers designed for outdoor use or those with waterproof housing can protect against rain or moisture. Investing in a robust, weather-resistant charger is essential for long-term use.
These features will help ensure optimal battery maintenance and prolong the life of your Harley motorcycle’s battery.
Which Harley Trickle Chargers Are Highly Recommended by Experts?
The highly recommended Harley trickle chargers include the Battery Tender Plus, NOCO Genius G3500, and Harley-Davidson Smart Charger.
- Battery Tender Plus
- NOCO Genius G3500
- Harley-Davidson Smart Charger
These chargers are often praised for their reliability, versatility, and compatibility with various motorcycle batteries. Each model has its own unique features and opinions may vary regarding their efficiency or ease of use. Some users prefer specific models for their price and warranty, while others may highlight technical aspects like smart charging capabilities.
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Battery Tender Plus:
The Battery Tender Plus model is known for its efficiency in charging and maintaining motorcycle batteries. It offers a charge output of 1.25 amps, making it suitable for most lead-acid and sealed batteries. The built-in microprocessor ensures the battery receives optimal charging. According to the manufacturer, it automatically switches to a float charging mode when the battery is fully charged, preventing overcharging and extending battery life. User reviews often highlight its affordability and longevity. -
NOCO Genius G3500:
The NOCO Genius G3500 charger stands out due to its advanced technology. It is a smart charger that can automatically detect the type of battery connected and adjust its charging method accordingly. This means it can handle multiple battery types, including lithium-ion, which many Harley riders appreciate. An independent test by Motorcycle Consumer News in 2020 reported that the NOCO Genius G3500 provided faster charging times and maintained the battery better than several competitors. Users often commend its versatility and user-friendly design. -
Harley-Davidson Smart Charger:
The Harley-Davidson Smart Charger is designed specifically for Harley motorcycles. It offers features tailored to the unique needs of Harley riders. This charger protects the battery by preventing overcharging through a step-down process. With a built-in diagnostics feature, it alerts users to battery issues. Some riders express concerns about its higher price point compared to other brands but appreciate its compatibility and specialization for their motorcycles. According to Harley enthusiasts, this charger can prolong a battery’s lifespan effectively when used properly.
How Do You Properly Maintain a Harley Trickle Charger for Optimal Performance?
Properly maintaining a Harley trickle charger involves regular inspection, correct connection, and ensuring optimal storage conditions for long-lasting performance.
Regular inspection is crucial for identifying potential issues. Check the following:
- Cables: Look for fraying or damage on the charger cables. Damaged cables can affect the charger’s efficiency and safety.
- Connectors: Ensure the connectors are clean and free from corrosion. Corroded connectors can impede the flow of electricity.
- Indicators: Observe the charge indicators on the charger. A malfunctioning indicator may suggest that the charger is not working properly.
Correct connection is essential to ensure safe and effective charging. Follow these guidelines:
- Battery connection: Always connect the charger to the battery terminals correctly. Connect the positive (red) terminal first, followed by the negative (black) terminal.
- Avoid reverse polarity: Connecting the charger backward can damage the battery and charger. Always double-check your connections.
- Monitor charging: During use, periodically check the charger to ensure it is functioning correctly and that the battery is charging as expected.
Storage conditions play a significant role in maintaining charger effectiveness. Address these points:
- Location: Store the charger in a cool, dry place, away from direct sunlight and extreme temperatures. High temperatures can damage battery cells.
- Humidity: Keep it away from moisture. Excess humidity can lead to corrosion and short circuits.
- Protection: Use a protective cover or case to shield the charger from dust and physical damage when it’s not in use.
By adhering to these maintenance tips, you can keep your Harley trickle charger operating efficiently and extend its lifespan.
What Are Common Problems with Harley Trickle Chargers and How Can You Fix Them?
Harley trickle chargers can face several common problems, but most are fixable with appropriate measures.
- Inconsistent charging
- Overcharging
- Charger failure
- Connectivity issues
- Wrong charger size
In addressing these issues, here are the details for each problem with Harley trickle chargers.
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Inconsistent Charging: Inconsistent charging occurs when the charger fails to maintain a stable output. Factors like poor connections or a build-up of corrosion on battery terminals can contribute to this issue. Regularly cleaning the connections and ensuring they are tight can improve the charger performance. Additionally, checking the charger’s settings, if adjustable, may help maintain a consistent charge.
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Overcharging: Overcharging happens when the charger continues to provide voltage after the battery is fully charged. This can cause battery damage and reduce lifespan. To prevent overcharging, some chargers come with automatic shut-off features. Users should verify that their trickle charger has this capability, or manually disconnect the charger when the battery reaches full charge.
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Charger Failure: Charger failure can result from internal component damage or wear. A charger that no longer works must be replaced. Users should regularly inspect their charger for any signs of wear or damage, such as frayed cables or scorch marks. Following the manufacturer’s instructions for maintenance can also help prolong the charger’s life.
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Connectivity Issues: Connectivity issues arise when the charger does not connect properly with the battery. Loose or corroded connections prevent effective charging. Users should monitor the charging cables and connectors, ensuring they are clean and securely attached. Using spray connectors designed for electrical systems can help maintain good conductivity.
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Wrong Charger Size: Using a charger that is not compatible with the battery size can lead to ineffective charging. It’s crucial to use a charger that matches the battery specifications exactly. Harley users should refer to the owner’s manual to ensure correct charger selection based on battery type and size.
By understanding these problems and taking preventive actions, Harley owners can significantly improve the reliability of their trickle chargers.
How Can a Trickle Charger Extend the Life of Your Harley Battery?
A trickle charger extends the life of your Harley battery by maintaining an optimal charge level, preventing sulfation, and enhancing battery performance.
Maintaining optimal charge level: A trickle charger provides a steady, low-level charge to the battery. This constant input prevents the battery from discharging too deeply during periods of inactivity. Research shows that batteries regularly maintained at an optimal charge can last significantly longer compared to those that are allowed to discharge completely (Battery University, 2021).
Preventing sulfation: Sulfation occurs when lead sulfate crystals form on the battery plates during discharge. This process can lead to reduced capacity and lifespan. A trickle charger keeps the battery at a fully charged state, thereby minimizing the formation of these harmful crystals. According to a study by J. K. Johnson (2019), maintaining a fully charged battery can reduce sulfation rates by up to 50%.
Enhancing battery performance: By ensuring that the battery remains charged and healthy, a trickle charger helps maintain the battery’s performance over time. A well-maintained battery can deliver a greater number of starting cycles and maintain a steady voltage. A study conducted by A. R. Smith (2020) revealed that batteries charged with trickle chargers exhibited 20% better performance metrics compared to batteries that were not regularly charged.
Using a trickle charger not only prolongs the battery’s life but also ensures reliability when you want to ride your Harley. Consistent care through trickle charging can lead to fewer breakdowns, a better start, and enhanced riding experiences.
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