A battery that sits through winter can lose enough charge to turn the first ride of spring into a frustrating jump-start. The right maintainer keeps voltage at a safe level without treating a stored car, motorcycle, mower, or boat battery like a disposable part. The Best battery tender for most people is the one that matches the battery chemistry and gives you a clear, dependable connection.
This list includes slow, gentle maintainers for powersports batteries, faster chargers for cars and trucks, and multi-voltage models that also handle lithium batteries. The Battery Tender Plus is our top pick for straightforward 12V storage, while the NOCO models make more sense when you need 6V support, lithium compatibility, or faster charging.
Comparison table
| # | Product | Award | Charging output | Battery support | Best for |
|---|---|---|---|---|---|
| 1 | Battery Tender Plus | Best overall | 1.25A | 12V lead-acid | Cars, motorcycles, and ATVs |
| 2 | Battery Tender Junior 750mA | Best for powersports | 750mA | 12V lead-acid | Long-term motorcycle storage |
| 3 | NOCO GENIUS1 | Best compact multi-voltage | 1A | 6V and 12V lead-acid, LiFePO4 | Small batteries and mixed fleets |
| 4 | Battery Tender 3A | Best 6V and 12V option | 3A | 6V and 12V lead-acid | Cars, trucks, and larger batteries |
| 5 | NOCO GENIUS10 | Best for fast charging | 10A | 6V and 12V lead-acid, LiFePO4 | Large batteries and recovery |
| 6 | Battery Tender 5A | Best 12V automotive charger | 5A | 12V lead-acid | Cars, SUVs, and trucks |
| 7 | Battery Tender Junior 800mA | Best for lead-acid and lithium powersports | 800mA | 12V lead-acid, LiFePO4 | Motorcycles and scooters |
| 8 | Battery Tender 4A | Best switchable automotive model | 4A | 6V and 12V lead-acid, LiFePO4 | Mixed vehicle batteries |
| 9 | NOCO GENIUS5 | Best all-purpose NOCO | 5A | 6V and 12V lead-acid, LiFePO4 | Vehicles, marine batteries, and storage |
| 10 | MOTOPOWER MP00205A | Best simple maintainer | 800mA | 12V lead-acid | Basic long-term maintenance |
1. Battery Tender Plus: Best Overall
Pros
- Four-step charging program
- Useful ring-terminal and alligator-clip cables
- Adaptive charging resumes when voltage drops
- Long 10-year warranty
Cons
- Limited to 12V batteries
- Not designed for lithium batteries
- Slower than higher-output automotive chargers
Best for: owners who want a proven 12V maintainer for a car, motorcycle, ATV, or lawn mower.
The Battery Tender Plus is the easiest recommendation here because it gets the central job right without making storage maintenance complicated. Connect the charger, choose the included cable that fits the battery, and let its adaptive system move through the charge cycle before settling into float maintenance. It feels purpose-built for the owner who wants to park a vehicle for weeks or months and return to a ready battery.
Its 1.25-amp output is a sensible middle ground. It is gentler than the 3A, 4A, 5A, and 10A models, which suits a motorcycle or ATV battery, but it has more charging headroom than the 750mA Junior. The four-step program covers initialization, bulk charging, absorption, and float behavior, so this is more than a fixed trickle feed. The two-color LED communicates charge status, and the charger resumes full output if voltage falls too far under load.
The included fused ring-terminal harness is the part that makes repeated use pleasant. Install it once on a hard-to-reach battery and use the quick disconnect rather than reaching for alligator clips every time. The 10-year manufacturer warranty and lifetime customer support also give this older, established design a level of long-term reassurance that the MOTOPOWER MP00205A does not match.
The limitation is clear: this is a 12V lead-acid charger. It supports automotive, motorcycle, and lawn mower applications, but the data does not identify lithium compatibility, and it cannot switch to 6V. If you need those features, the NOCO GENIUS1 is the more flexible alternative. For ordinary 12V lead-acid storage, however, the Battery Tender Plus remains the Best battery tender for the widest range of owners.
2. Battery Tender Junior 750mA: Best for Powersports
Pros
- Gentle 750mA output for powersports batteries
- 12-foot output cord
- Four-step automatic charging
- Spark-proof and reverse-polarity detection
Cons
- Lead-acid batteries only
- 12V operation only
- Not intended for quick automotive charging
Best for: motorcycle, ATV, scooter, and other 12V lead-acid powersports batteries in storage.
The Battery Tender Junior 750mA is deliberately modest. It is not the charger to reach for when a truck battery needs a fast recovery. It is the one to connect to a motorcycle or ATV that spends more time parked than running, where a controlled maintenance charge matters more than high output.
The four-step sequence moves from initialization to bulk charging, absorption, and float mode. That progression allows it to bring a compatible 12V lead-acid, flooded, AGM, or gel battery to full charge and then maintain voltage without continuously forcing the same current into it. The two-color LED provides a basic status check, while adaptive charging can resume full output if the battery drops too far under load.
The 12-foot output cord is a practical advantage over the Battery Tender Plus. It gives more freedom when the battery is tucked inside a powersports frame or the wall outlet is not immediately beside the vehicle. The included fused ring-terminal harness is useful for a semi-permanent setup, and the alligator clips cover occasional connections. Spark-proof circuitry and reverse-hookup detection make the first connection less nerve-racking.
Compared with the Battery Tender Junior 800mA, this model is slightly more conservative and is limited to lead-acid batteries. The 800mA version adds a selectable lithium mode, so lithium powersports owners should skip this one. For a conventional 12V motorcycle or ATV battery that will sit through an off-season, this Junior is a clean, uncomplicated choice.
If you are deciding between a charger and a dedicated long-term maintainer, the charging habits that protect a stored vehicle battery are more important than chasing the highest amp figure. The Junior 750mA fits that storage-first use particularly well.
3. NOCO GENIUS1: Best Compact Multi-Voltage
Pros
- Supports 6V and 12V batteries
- Works with lead-acid and LiFePO4
- Temperature compensation
- Force Mode can address severely discharged batteries
Cons
- 1A output is slow for larger automotive batteries
- Force Mode requires careful use
- More settings than a basic maintainer
Best for: owners who need one small charger for both 6V and 12V lead-acid or lithium batteries.
The NOCO GENIUS1 is the small charger with the broadest brief in this group. Its 1A output keeps it close to the Battery Tender Plus for ordinary maintenance, but its ability to work with both 6V and 12V batteries and with LiFePO4 chemistry makes it far more adaptable. That matters for a garage containing a classic 6V application, a modern car, and a powersports battery.
The charger accepts 6V and 12V lead-acid batteries, including AGM, gel, SLA, and VRLA types, along with 12V LiFePO4 batteries. An integrated thermal sensor adjusts charging for ambient conditions, helping prevent overcharging in hot weather and undercharging in cold conditions. That automatic adjustment is more useful than it sounds when a vehicle is stored in an unheated garage or a hot shed.
NOCO also gives this compact model capabilities that its output alone would not suggest. It can charge batteries from as low as 1V, while Force Mode can manually charge a battery down to zero volts. Pulse charging is intended to address sulfation and acid stratification. Those features make the GENIUS1 a more capable recovery tool than the Battery Tender Junior 750mA, though they also mean the owner needs to select the correct mode rather than simply connect it blindly.
At 0.95 pounds and roughly 3.5 by 2.3 by 1.3 inches, it is easy to store and carry. The 110-inch DC cable, clamps, and integrated eyelet terminals cover both temporary and semi-permanent connections. Its weakness is charging speed. A large car or truck battery will take much longer here than with the GENIUS5 or GENIUS10. Choose it for flexibility and compactness, not rapid turnaround.
4. Battery Tender 3A: Best 6V and 12V Option
Pros
- Switches between 6V and 12V
- 3A output suits automotive batteries
- Supports flooded, AGM, and gel batteries
- Eleven feet of combined cord reach
Cons
- Lithium support is not clearly listed in the features
- Larger than the compact NOCO GENIUS1
- Not as fast as a 5A or 10A charger
Best for: owners who need a switchable 6V and 12V charger for conventional automotive batteries.
The Battery Tender 3A is built for the garage where battery types and vehicle sizes vary. Its push-button selection between 6V and 12V gives it a useful advantage over the Battery Tender Plus and both Junior models. Three amps also makes it a more practical choice for a car, SUV, or truck battery that needs a proper recharge before it settles into float mode.
The charging sequence is automatic. Once the battery is full, the charger switches to float maintenance, and its ISM adaptive charging can return to full output if voltage falls under load. The solid-state two-color LED keeps the interface simple. Spark-proof connection and reverse-polarity detection add a layer of protection against the mistakes that are easy to make when working around a vehicle battery.
The included cable setup reaches 11 feet in total, with a 6-foot AC cord and 5-foot DC charging cord. That is enough flexibility for a driveway or garage connection without placing the charger directly on the battery. It includes both ring terminals and alligator clips, so it can stay installed on one vehicle or move between batteries. The charger is compatible with lead-acid, flooded, AGM, and gel-cell batteries.
This model is less compelling for a lithium owner because its supplied features do not clearly identify lithium support. The Battery Tender 4A offers lithium compatibility and the same 6V and 12V switching, while the NOCO GENIUS5 adds LiFePO4 support and temperature compensation. The 3A earns its place for conventional batteries and a mixed 6V/12V garage, especially when you prefer Battery Tender's straightforward controls.
For readers comparing this category with a faster one-time recharge, how a charger differs from a long-term battery keeper helps clarify why the float stage matters. The 3A is designed to do both jobs, but its strongest use is safe ongoing maintenance after the initial charge.
5. NOCO GENIUS10: Best for Fast Charging
Pros
- Highest charging output in this roundup
- Supports 6V and 12V batteries
- Lead-acid and LiFePO4 compatibility
- Temperature sensor and desulfation mode
- Includes a mounting bracket
Cons
- Heavier and larger than low-output maintainers
- Excessive for a small motorcycle battery
- Manual Force Mode needs care
Best for: owners who need rapid charging and maintenance for large automotive, marine, or powersports batteries.
The NOCO GENIUS10 is the clear choice when a maintainer also needs to function as a serious charger. Its 10A output is several times higher than the Battery Tender Plus and Junior models, so it is better suited to large car, truck, RV, marine, and deep-cycle batteries. It still switches into long-term maintenance, but it does not make you wait on a small powersports charger when a bigger battery needs attention.
It handles 6V and 12V lead-acid batteries, including AGM, gel, SLA, and VRLA types, as well as LiFePO4 batteries. The integrated thermal sensor adjusts the charge according to ambient temperature, a useful safeguard when the charger is working through changing garage conditions. NOCO's pulse charging is designed to detect and reverse sulfation and acid stratification, though it should not be treated as a guarantee that a failed battery can be revived.
The GENIUS10 can charge from as low as 1V and includes a Force Mode for completely dead batteries down to zero volts. That is a meaningful capability when a neglected battery is too low for a normal automatic charger to recognize. It also comes with an 80-inch DC cable, clamps, integrated eyelet terminals, and a mounting bracket with screws. At 3.99 pounds, it is substantially heavier than the GENIUS1 or GENIUS5, but that weight is acceptable for a charger likely to stay mounted in a garage.
The trade-off is scale. A 10A unit is more charger than most motorcycle owners need for winter storage, and the higher output does not make it a better maintainer for every small battery. The GENIUS5 is the more balanced NOCO for mixed everyday use, while the Battery Tender 5A is a simpler 12V automotive alternative. Pick the GENIUS10 when charging speed, broad chemistry support, and recovery functions matter more than compactness.
6. Battery Tender 5A: Best 12V Automotive Charger
Pros
- 5A output for cars, SUVs, and trucks
- Automatic float maintenance
- Eleven feet of combined cord reach
- Spark-proof and reverse-polarity protection
Cons
- 12V only
- Lithium compatibility is not identified in the features
- Less versatile than the multi-voltage NOCO models
Best for: owners who want a faster 12V charger and maintainer for conventional automotive batteries.
The Battery Tender 5A takes the familiar Battery Tender approach and gives it enough output for bigger automotive batteries. Five amps is a useful step up from the Plus and Junior models when a car, SUV, or truck has been sitting low. Once the battery reaches full charge, the unit automatically moves into float mode rather than continuously charging at the maximum rate.
Its ISM adaptive charging monitors the battery and can resume full output if voltage drops too far under load. A two-color LED shows the basic state without forcing the owner through a menu. The charger also uses spark-proof connection and reverse-polarity detection, two practical protections when connecting clamps in a dim garage or reaching around a battery compartment.
The 11-foot combined reach, made up of a 6-foot AC cord and 5-foot DC output cord, gives this model a useful installation advantage. It includes a ring-terminal and alligator-clip combination cable, so you can leave a harness attached to a vehicle or connect temporarily as needed. Its compact 1.44-pound body is easier to position than the heavier GENIUS10.
The model is narrower than the NOCO options. It is intended for 12V operation, and the listed features do not identify lithium support. The Battery Tender 4A adds 6V switching and LiFePO4 compatibility, while the NOCO GENIUS5 adds temperature compensation and a desulfation function. Choose the 5A when you have conventional 12V automotive batteries and want more charging speed without moving to a larger, more feature-heavy unit.
If the battery is already showing signs of trouble, the readings that reveal a battery is failing can prevent you from mistaking a worn-out battery for one that merely needs more charging time. A maintainer can preserve a healthy battery, but it cannot replace one that no longer holds a charge.
7. Battery Tender Junior 800mA: Best for Lead-Acid and Lithium Powersports
Pros
- Switchable lead-acid and lithium modes
- Compact powersports design
- Spark-proof and reverse-polarity detection
- Five-year warranty
Cons
- Only 800mA output
- 12V only
- Not suited to quick charging of large batteries
Best for: owners of 12V motorcycles, ATVs, UTVs, scooters, or personal watercraft with either lead-acid or LiFePO4 batteries.
The Battery Tender Junior 800mA solves a specific problem that the older 750mA Junior does not: it lets the owner choose between lead-acid and lithium battery modes. That small switch changes who should buy it. If your motorcycle or ATV uses a LiFePO4 battery, or you may change battery chemistry later, this model is a safer fit than a lead-acid-only maintainer.
Its 800mA output is intentionally gentle. The charger is meant to keep a 12V powersports battery ready rather than rapidly refill a large automotive battery. An ISM microcontroller updates the charging sequence, and the unit automatically maintains the selected battery type. The manufacturer also lists spark-proof connection and reverse-polarity detection, which makes the basic connect-and-leave routine easier to manage.
The design is compact and suited to tight storage spaces, although the supplied dimensions are inconsistent across the product information and should not be treated as a reliable measure of its exact physical size. The key functional parts are clearer: it is a 12V unit, it supports flooded, AGM, and gel lead-acid batteries along with LiFePO4, and it carries a five-year warranty. Those details matter more than a nominal chassis measurement when choosing a powersports maintainer.
Compared with the Junior 750mA, this is the obvious pick for lithium compatibility, but it does not offer the 750mA model's stated 12-foot output cord. The NOCO GENIUS1 goes further with 6V support, temperature compensation, and a desulfation function, while the Battery Tender Junior 800mA keeps the controls simpler. Buy it for a 12V powersports battery that needs chemistry-specific maintenance, not for a truck that needs a fast charge.
8. Battery Tender 4A: Best Switchable Automotive Model
Pros
- 4A output
- Switchable 6V and 12V operation
- Supports lead-acid and LiFePO4 batteries
- Long combined cord reach
Cons
- Heavier than the Battery Tender 5A
- No listed temperature sensor
- Not as fast as the NOCO GENIUS10
Best for: garages that need one Battery Tender unit for 6V and 12V lead-acid or lithium batteries.
The Battery Tender 4A is one of the most flexible Battery Tender models here. It combines a useful automotive output with a switch between 6V and 12V, then adds support for LiFePO4, AGM, gel, flooded, and other lead-acid batteries. That makes it a practical single-charger solution for a garage with a modern vehicle and an older 6V application.
At 4A, it sits between the Battery Tender 3A and 5A, but its real distinction is not the one-amp difference. It automatically charges a battery, shifts into float mode when full, and resumes adaptive charging when voltage falls under load. The two-color LED gives a quick status indication. Spark-proof connection and reverse-polarity detection help prevent a wrong connection from turning into a larger problem.
The charger includes a ring-terminal and alligator-clip combo cable, plus 11 feet of combined AC and DC cord reach. That is enough flexibility for a battery mounted deep in a vehicle or for a charger positioned on a nearby shelf. At 2.4 pounds, it is heavier than the Battery Tender 5A despite having a lower listed output, so it is not the obvious choice when portability is the priority.
The NOCO GENIUS5 is a stronger rival if you want temperature compensation, pulse desulfation, and a more explicit recovery feature set. The Battery Tender 3A offers a similar 6V/12V concept with a lighter listed weight, but its listed features do not identify lithium support. This 4A model is best when chemistry flexibility and Battery Tender's simple float-maintenance behavior matter more than the smallest enclosure.
9. NOCO GENIUS5: Best All-Purpose NOCO
Pros
- 5A output for a broad range of vehicles
- 6V and 12V support
- Lead-acid and LiFePO4 compatibility
- Temperature compensation and desulfation
- Mounting hardware included
Cons
- Larger than the GENIUS1
- Slower than the GENIUS10
- More functionality than a simple storage maintainer needs
Best for: owners who want one versatile charger for automotive, marine, powersports, and deep-cycle batteries.
The NOCO GENIUS5 is the middle sibling that makes the most sense for many mixed-vehicle garages. Five amps is enough to make a meaningful difference with a car or SUV battery, while the unit remains more manageable than the GENIUS10. It also preserves the features that make the GENIUS range distinctive rather than simply increasing output.
It charges and maintains 6V and 12V lead-acid batteries, including AGM, gel, SLA, and VRLA types, as well as LiFePO4 batteries. The thermal sensor adjusts the charge to ambient conditions, which helps in garages that swing from cold to hot. The charger also uses pulse charging to address sulfation and acid stratification, and it can charge batteries from as low as 1V.
Force Mode extends the recovery capability to completely dead batteries down to zero volts, though this is a feature to use deliberately rather than casually. The 72-inch AC cable, 80-inch DC cable, clamps, eyelet terminals, mounting bracket, and screws make it suitable for a semi-permanent garage installation. Its 1.59-pound weight is reasonable for a 5A unit.
The Battery Tender 5A is simpler if you only need 12V conventional automotive charging, and the GENIUS10 is the better choice for maximum output or larger batteries. The GENIUS1 is easier to tuck away and better suited to small batteries. The GENIUS5 occupies the useful center: broad chemistry and voltage support, enough output for common vehicles, and a feature set that can handle neglected batteries as well as routine storage.
10. MOTOPOWER MP00205A: Best Simple Maintainer
Pros
- 800mA output for gentle maintenance
- Automatic desulfation
- Overcharge, short-circuit, and reverse-polarity protection
- Spark-free connection
Cons
- 12V lead-acid batteries only
- No stated lithium support
- No 6V operation
Best for: owners who need a basic 12V lead-acid maintainer with automatic charging and desulfation.
The MOTOPOWER MP00205A keeps its mission narrow. It is an automatic 12V charger, maintainer, trickle charger, and desulfator for lead-acid batteries. For a car, motorcycle, lawn mower, or other 12V vehicle that spends long periods parked, its 800mA output is suited to maintaining charge rather than forcing a rapid refill.
Its charging program reaches 14.4V, then maintains the battery at 13.6V. A 24-hour timer ends the charging phase and moves into maintenance once voltage is above 14V. Those concrete control points make the behavior easier to understand than a vague promise of smart charging. The unit also automatically detects sulfation and applies pulse current during charging without requiring a separate desulfation mode.
Safety features include overcharge, short-circuit, and reverse-polarity protection, along with spark-free connection and zero output in standby mode. The product information lists a size of 2 inches deep by 4.1 inches wide by 1.5 inches high, while the separate dimensional fields are inconsistent. The listed size is the more useful description to keep in mind when considering storage.
The limits are just as important as the features. This model is for 12V lead-acid, flooded, AGM, and gel batteries, with no listed lithium or 6V support. The Battery Tender Junior 800mA is a better match for lithium powersports batteries, and the NOCO GENIUS1 is more capable for mixed battery types and deeply discharged batteries. Choose MOTOPOWER when a straightforward 12V lead-acid maintainer is all you need.
How to choose best battery tender
The right maintainer depends on the battery's voltage and chemistry first, then on how quickly you need to restore charge and how permanent the connection will be.
Voltage selection
A 12V charger is appropriate for most cars, motorcycles, ATVs, lawn mowers, and trucks in this roundup. A 6V/12V model such as the NOCO GENIUS1, NOCO GENIUS5, NOCO GENIUS10, Battery Tender 3A, or Battery Tender 4A is the safer choice when you also have a 6V battery.
Do not connect a 12V setting to a 6V battery. Switchable models are useful only if you confirm the selected voltage before charging.
Battery chemistry
Lead-acid batteries include flooded, AGM, gel, SLA, and VRLA variations. Lithium batteries need a compatible charging mode, typically identified here as LiFePO4. The Battery Tender Junior 800mA, Battery Tender 4A, and NOCO GENIUS models explicitly support both categories.
The Battery Tender Plus, Battery Tender Junior 750mA, Battery Tender 5A, Battery Tender 3A, and MOTOPOWER MP00205A have features that identify lead-acid support, but do not treat them as lithium chargers without clear confirmation for your battery.
A charger that matches the battery chemistry is more important than one that simply has more amps.
Charging output
Low-output models from 750mA to 1.25A are well suited to motorcycle, ATV, scooter, and long-term storage duties. They charge gently, but they can take a long time to restore a larger car or truck battery.
The 3A to 5A models are more useful for ordinary automotive batteries, while the NOCO GENIUS10's 10A output is the strongest fit for large batteries or owners who need faster recovery. More output is not automatically better for a small powersports battery.
Float maintenance
A proper maintainer should charge the battery and then reduce its output into a maintenance or float stage. That lets the battery remain connected for storage without receiving the same charging current continuously.
Battery Tender models in this list use automatic float behavior, while the NOCO models monitor the battery and maintain it indefinitely. MOTOPOWER specifies a 13.6V maintenance stage after its charging cycle.
Connections and reach
Ring terminals are useful when a battery stays in one vehicle for the season. Alligator clips are better when the charger moves between vehicles. Look for both if you want flexibility.
Cord length also matters when the battery sits deep inside a motorcycle or the vehicle cannot be parked directly beside the outlet. The Battery Tender Junior 750mA lists a 12-foot output cord, while several automotive Battery Tender models list 11 feet of combined AC and DC reach.
Frequently asked questions
Can a battery tender stay connected all winter?
The models in this roundup are designed to move from charging into float or maintenance operation. That makes them suitable for long-term storage when connected to a compatible battery and used according to the manufacturer's instructions. Always confirm the battery type and voltage before leaving a charger attached.
What is the difference between a trickle charger and a maintainer?
A basic trickle charger may continue sending a fixed current, while a smart maintainer adjusts its charging behavior and switches into a lower maintenance stage after the battery is full. The products here use automatic charging programs, float modes, or ongoing monitoring rather than a simple constant feed.
Which battery tender is best for a motorcycle?
The Battery Tender Plus is the strongest general recommendation for a 12V lead-acid motorcycle battery. The Battery Tender Junior 750mA is a gentler powersports-focused option, while the Battery Tender Junior 800mA is the better choice when the motorcycle uses a LiFePO4 battery.
Can these chargers work with lithium batteries?
Some can. The NOCO GENIUS1, GENIUS5, and GENIUS10, along with the Battery Tender Junior 800mA and Battery Tender 4A, list LiFePO4 compatibility. The other models should be treated as lead-acid chargers unless the battery and charger documentation confirms otherwise.
What should I use for a 6V battery?
Choose a charger that explicitly supports 6V operation, such as the NOCO GENIUS1, GENIUS5, GENIUS10, Battery Tender 3A, or Battery Tender 4A. Check the selected mode before connecting, since the wrong voltage can damage a battery.
Can a battery maintainer revive a dead battery?
Some models can attempt recovery from a deeply discharged battery. The NOCO GENIUS1, GENIUS5, and GENIUS10 list charging from as low as 1V and include Force Mode for batteries down to zero volts. A battery that has permanently failed or cannot hold a charge still needs replacement.
The bottom line
The Best battery tender for most 12V lead-acid vehicle owners is the Battery Tender Plus. Its 1.25A output, four-step charging program, useful connection options, and long warranty make it a sensible fit for cars, motorcycles, ATVs, and lawn equipment that spend time parked.
Choose the NOCO GENIUS5 if you need 6V support, LiFePO4 compatibility, temperature compensation, desulfation, and enough output for larger batteries. For the fastest charging in this group, step up to the NOCO GENIUS10, while the Battery Tender Junior 800mA is the more focused choice for lithium powersports batteries.
If you are undecided, match the charger to your battery's voltage and chemistry before comparing amp output.
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