Installing anything through Google Play Store
needs more research
confirmed x 1
situational
when used
Possible causes: decompression may be heavy on the CPU, perhaps some microSD cards are more demanding
Workaround: none, except try to install what you need ahead of time and only update while charging.
(I’m going to abuse my “authority” and use my own confirmation here)
When installing or updating apps the battery level can drop by 10%-20% for what is supposed to be an update of a few megabytes. Not confirmed by others, more research is needed.
Originally, I presumed this was due to file-by-file patching, which is extra demanding on the CPU (but saves data). However, FbF patching only happens when charging and with auto-updates, and this also applies to manual installations. Also, it has not been confirmed by others. So the cause of the problem is a bit of a mystery.
Currently, two hypotheses exist: compression levels vary per app, so some may be very draining to unpack. Furthermore, maybe microSD cards do not all use the same amount of battery, making it possible that installing an app to them is more draining on some FP models. I use a SanDisk Extreme 64GiB, which is supposed to be really fast to read/write to (for photography purposes) but that could come at the price of needing more battery power to write.