My family has had many brands of phones throughout the years Nokias, LGs, Samsungs, Motorolas, Kyoceras, and even a Blackberry. Flip, stick, slide, full keyboard, slab, you name it. (granted a lot of them were cheap phones) But out of all the phones, the only two batteries that ever swelled up on us were on 2 LG phones. I dunno what they're making them out of? Or rather were... since LG stopped making phones a couple of years back.What are y'all doing to those phones! I've never had a battery swell up. Must be all the calls I avoid, like son.