Hi there,
Last days i noticed something strange, after 10 minutes (maybe even less), my battery drops very quickly and shuts down phone. Using google maps or HereWeGo (offline maps). (on bike).
Rebooted couple of times (by the way very very slow reboot..)
Any tips? or is my FF4 slowly dying.. (battery also renewed couple of months ago).
thnx!
Hi,
FP4 user here. It’s probably a temperature thing. When the battery gets too cold, it drains really quickly. I’ve had this happening a couple of times while cycling as well.
wow.. but so quick? like 5/10 minutes from 60% tot shutdown 
never noticed this before.
Hi myrok24,
with my recently received (gifted) used FP4 runnung under IodeOS with the preinstalled CoMaps App and SherpaTTS i tested navigation with voice output. I drove by car about per 45 km distance in about 40 min with a battery draining of about 25%. This was in normal working conditions - the switch for reduced battery draining which the app provides was not activated.From talking to others I think this are ‘normal costs’ for active navigation with a FP4.
Greetings !
Today it lasted way more long: cycled one hour, 50% battery drop, ..so perfect! warmer weather, but i also switched OFF background usage in the battery menu. But honestly i dont’t know if that affects traffic updates in the car..
Most influence on energy consumption comes from the ability to switch the parts of your device in low energy mode, that are currently not used..
I think the gap between your and my experience may come from battery consumption of your other apps and configuration.
I have very few apps installed, a recently installed system that cares for privacy (also meaning few energy consuming tasks to tell anybody where and when I’m doing what) and while configuring I consequently care for battery consumption. Together this makes my phone to consume few energy - I guess this saves about 10-20% of ‘normal’ battery draining.
For example CoMaps works all offline, including speech output with SherpaTTS and my mail and IM apps check their connections not so often as other apps do. So the modems of my phone may stay in low power mode more time.
Check for switching off unused devices off (NFC, WLAN, BT, …). There may be system options to switch them off automatically when not used for awhile and there are apps that do this, when no system option is available.
Look for apps you don’t need (any more) and try disabling or uninstall (all of) them.
Check the energy related options (adjusting display timeouts and frequency of connection checks or data polling, etc.) in the settings of your system and your apps.
Try to use the low energy switch of your system and maybe of your navigation app if it has such.
… or use software that has more switches for that stuff. 
Anyhow: Enjoy !