I confirm that; I did my own battery replacement on old iPhone4 that I bought cheaply on Amazon. Year later I changed the phone and never cared to sell this one. Fast forward this year to garage cleanup - same picture the battery inside expanded dramatically destroying the case. Little I know I left it outside for recycling to pick it up. Next morning all my trash is splattered everywhere and neighbor said he hear explosion. The battery got wet and exploded! I took tons of photos but it was on my previous iPhone so unable to upload any at the moment.