So-called 'slim' extended batteries make me suspicious.....

For years now manufacturers have thought we prefer having dead but omg so thin phones instead of ones that actually make it through the day. I've always bought phones that had removable batteries so that I could buy extended batteries and turn my phone into a brick that allows me to charge it at night and use at will during the day. Most of these are oversized and require a special back cover. However, I see a lot of 'slim' extended batteries that can fit into your current phone without a bigger back. They're plentiful, and they're cheap. So why don't manufacturers just include an extended battery that is the same volume but more capacity?

I suspect that perhaps they're less safe? I recently had an extended battery start bulging inside my phone and pushed the screen up a little. I wouldn't have noticed if the screen hadn't started coming up. Scared me a little, we've all seen the pics of phones that have exploded in people's pockets.

Does anyone know more about this than me?

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