I've only had them for about a month. I bought 2. I put one the kids 4 wheeler and the battery was dead and old, I let it sit for about a day and it has started right up everytime ever since. I do keep it plugged in now. Also put 1 on my Chopper with a brand new battery, Batteries are getting expensive. This is a way to try and keep them running longer. So far so good
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