The Galaxy S5 (and previous models) has a removable back (just needs a fingernail) that gives access to the battery (which also requires only a fingernail). The

The Galaxy S5 (and previous models) has a removable back (just needs a fingernail) that gives access to the battery (which also requires only a fingernail). These batteries are not so incredibly hazardous that they need a shell - I've opened up other devices with bonded batteries and their battery packs are not so much easier to damage that an "untrained user" is at risk of severe injury. The battery cells are designed to be fairly robust - punctured a Kindle battery during a screen repair (friends roommate came home drunk, bumped into the table while I was picking away at the glue) and there was a very brief tiny poof of smoke and nothing else. If the battery hadn't been glued, that situation would have been impossible. I also don't recall seeing any news articles back in the days of near universal user swappable batteries about widespread incidences of users being injured by swapping phone batteries. It's also less likely you will damage a battery if you just have to undo a couple screws instead of sitting there with a heat gun, from a repair tech perspective - but I've only seen batteries held down by screws in unibody laptops.