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when i got one that shipped from china, i think, the mechanism to prevent overcharging was malfunctioning so the battery was becoming bloated. I think I Just got unlucky because i've seen others that use these batteries fine. Another thing is some of those poly-ion batteries are not really designed for use with our chargers. I've also heard that there's always the risk of a poly-ion battery exploding and causing some serious problems, but i have yet to see that happen. At the end of the day you're going to get what you pay for.
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