If you can't pull the battery...

Slightly odd question - I have an S5 and flash ROMS. If something goes wrong and I get a boot loop or a slightly dead phone, I just pull the battery and all is well. What do you do on an S7 or S6 etc, where you can't get at the battery? I assume you don't just wait until the battery goes flat! :)
Looking forward to an S7 Edge when SIM free prices fall...

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