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To be fair, we have owned many amazon devices and never had a dud battery. Even the 2012 kindle fire still used for grandchild is still OK. But those are all/were all in regular use.
What I read was that storing a device for a very long time with a flat li-on battery is bad for batteries. They should be stored partly charged and tppped up every few months for best battery life. So a 2014 device, never opened for 4 years, could have a battery problem
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