I've used this on everything from a large group 27 battery to a small motorcycle battery. It's easy to use, but I've found that it doesn't replace a regular charger for a dead battery. I stumbled upon this once and used an old charger to charge it until it could recognize it. Update December 2020 I bought it in January, about 11 months ago. It still works, but it is sometimes not possible to switch from seal wire to AGM battery mode or from car mode to motorcycle mode. The switches aren't quality enough to last long, made worse by the fact that I've only used them about 6 times in those 11 months. Downgraded to 4 stars. Updated March 2021 It is now attached to a motorcycle/AGM. Luckily my bikes have AGM batteries, otherwise I would have thrown them away. Downgraded to 2 stars. Tried to contact manufacturer, waste of time.
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