One battery is already defective after only owning the set for 7 months

I love the tools. I've had friends and family recommend Ryobi for years and I have been satisfied with the function of the tools themselves. I'm only giving three stars because one of the batteries is already "defective" according to the test in the charger. I've only used the batteries a handful of times each, a few screws here and there. Cut a couple of boards. No reason the battery should be defective already. Hopefully if I get more from Home Depot they will last longer.

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