BatteryMINDer 1500: 12 Volt-1.5 AMP Battery Charger, Battery Maintainer, and Battery Desulfator with SmartTECHnology - Designed for Cars, Trucks, Boats, Motorcycles, Snowmobiles, Jet Skis, Golf Carts

Excellent Battery Tender/Maintainer and decent battery charger. While this charger will only do 1.5amps, it can reliably charge just about any large battery, deeply discharged or not if given enough time. Just remember, 1.5amp = 1.5 amps per hour so at a minimum, a 50AH battery could take over 24 hours to charge from a completely discharged state (less than 11V). The biggest benefit/feature of this charger is to inexpensively desulfate and maintain your batteries. Yes batteries because you can buy a Y splitter and maintain multiple batteries at a time. It's great that they've included onboard temperature compensation as the previous low cost battery minder chargers didn't have such a feature, making this the ultimate low cost battery charger/tender/desulfator on the market today. I've had great experience with the BatteryMINDer brand of chargers. Though it can't recover every single bad battery you come across, for those that it can recover, it does an excellent job. I have the original battery in a 2004 Volvo S60 that is located in the trunk, so it's not exposed to much heat, and thanks to this charger, I was able to recover it. The car spends most of its time parked so what must have happened was the plates got heavily sulfated due it spending extended periods of time in a state of discharge. The battery after a full charge would reach 12.7v which indicates a healthy battery but after using the headlights for about 30s to remove the surface charge, the battery would revert to 11.9V which indicates an unhealthy battery. The car would crank over fine but knowing that the battery didn't have much reserve capacity was worrisome. So after about 3 months with the batteryminder tending to the battery, the battery in this car now has a much healthier resting voltage of 12.5V, a major increase in reserve capacity. Update: Took the BatteryMINDer 1500 off a car I was tending (the one I mentioned with a resting voltage of 12.5v) to use it on another car battery that needed some work. Came back a month later, and I saw that instead of a 12.5V resting voltage, it now has a 12.65v resting voltage, despite the parasitic load! So I guess the battery has improved to the point to where the reserve capacity is like new again. The charger had been tending to this car for about a year now but having that improvement from 12.5V to 12.65 means I've got 94% of the battery's original reserve capacity.

Very reliable and removes calcification of the battery plates! My truck battery is 11 years old and still in good condition

Best one to buy

I was having issues with my 4 wheeler not starting. I keep this on whenever I'm not using it and it always starts right up now and I haven't noticed a huge increase in my electric bill.

So far I’m really liking this little maintainer. I already own a few high-end chargers, but this is my first true maintainer, and it’s actually the second 1500 I’ve bought this month. We’ve been driving a lot less lately, which has forced me to learn the hard way about battery sulfation and the headaches (and costs) it causes, including how it can confuse a vehicle’s charging system. That’s when I realized how important it is to understand the difference between a charger and a maintainer. If you’re just starting to look into this stuff like I was, honestly, asking ChatGPT about it helped clear things up. A real maintainer can safely run in float or pulse modes and stay connected 24/7 without overcharging—and not every charger that claims a float mode actually qualifies as a maintainer. What I wanted was something genuinely smart (microprocessor-controlled), with automatic voltage and current regulation. I also preferred a low-current unit, since there’s less chance of doing damage if something ever goes wrong, like a regulation failure or a bad read on the battery’s condition. On top of that, I wanted frequency-pulse desulfation. This one hits all those points.

After one year of use, I have found this to be my best Battery Maintenance and Storage system for Sealed and Flooded LeadAcid Batteries. Pro's: 1. Smart, Reliable and Automatic: This unit has a timer-controlled multistage algorithm including: Battery Check, Constant Current Charge, Conditioning Charge, Desulfation Check, and long-term Constant Voltage Float Charge. It works flawlessly for both Automative Starter Batteries and Sealed AGM batteries. I can leave the charger attached for months without fear of 'cooking' the battery. 2. Does produce a 5Amp 'DeSulfation' Pulse which may be effective in reviving and/or preventing mild Sulfation. Con's: 1. Limited Success in Reviving Various Sealed and Starter Batteries: Overcharged (Vented) AGM Sealed batteries had little or not improvement. 'Worn' Starter Batteries did not improve AmpHour Capacity after weeks of "Desulfation" by the charger. Obviously, only a fraction of 'bad' batteries have only 'mild' sulfating problems. The majority have severe capacity loss due to: Vibration Damage, Electrolyte Loss, Grid Corrosion and/or Severe Sulfation; all of which cannot be fixed. 2. Not suited for "Cycle Charging": Since this only charges at 1.5Amps, it takes too long to charge Auto Batteries (Typical Capacity is about 20-60 AmpHours). Furthermore, some AGM batteries such as ODESSEY, require greater than 40% of the AmpHour Capacity Charge Rates when significantly discharged (for example, 28AmpHr Battery needs to be charged at a minimum of 10.7 Amps). Overall, this is my Charger for long-term storage and battery maintenance. But I still need a higher current charger for DeepCycle charging. The best way to prolong LeadAcid Battery life is to use the recommended ConstantCurrent/ConstantVoltage two step charging process which prevents Overcharge Damage by limiting Charging Voltage below 15V and by maintaining the battery charge to reduce sulfating by maintaining the battery voltage at a constant voltage of 13.2 to 13.5V. This charger does this reliably.

I've been using Battery Minder products for several decades. I used them on a work truck which sat unused for weeks at a time. I've used a dual circuit on an RV for years. And I use this special one on a motorcycles which also sometime sits for months. THEY DO NOT CHARGE UNLESS THE BATTERY NEEDS IT ! This protects the chemistry of the battery.

Good unit, I have several and haven't had any issues with any of them.