>> I do find using google maps for satnav kills the battery, both on my old
>> iPhone SE and my old Sony Experia, I have just got a replacement SE (the
>> old one's battery died) so it will be interesting to see if that is any
>> different.
>> All done without having the phone connected to power while in use.
It will, Sat Nav heavily uses all the phones subsystems, All the I/O - Data modem, GPS receiver, Audio, All the CPU functions, and the GPU for graphics - ALL the time its being used. If you use Waze, the graphics gets hammered even more heavily and the data is much heavier.
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