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The one that swelled is the one you left plugged in. It's not a defect, you overdischarged it, then tried to charge it, and it swelled.
1) Don't discharge LiPo batts with your charger if you're doing that, they don't need it
2) Don't ever leave any battery plugged into a gun with an SW-COMP. They drain a small amount of power even when you're not using the gun, so if you leave a LiPo plugged in, it's guaranteed to over-discharge
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