Ryobi batteries have a 3 year warranty so I think you can just take them into Home Depot for exchange. I have had some problems with the black 18 volt batteries in the past dying but the larger green tops have been fine for about 5 years now, I have two 40v, six green tops and two grey top 18v batteries. I do not keep my batteries in the garage in the winter though, I bring them inside for winter storage. I do keep them outside in the summer time and heat so far has not hurt my 18v lithium batteries so far.
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going bandit-Reynolds style
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