Yesterday I received the update 13.40 for my fenix 5 wifi (with sapphire glass). And the battery was discharged by 10% within 12 hours (no GPS usage today). The same problem existed before, but the firmware 12.30 fixed it. And the battery drain was OK about 7-10% within 24 hours.
Does anyone have any idea what to do? I have already restarted the watch, which did not help.
We have identified a possible issue with software version 13.40 for the fenix 5 that can cause additional battery drain to take place. If you are experiencing increased battery drain on your fenix 5, update…
yeah, i have same issue with 13.40. 20% of battery use in 24 hours on watch mode. terrible. Please Garmin fix the battery problems.
Hi all,
I also have the same problem for a fenix 5, from yesterday night till this morning 10% of the battery went while I was sleeping....
Yep, I had a "sudden flat battery event" too, around the time of the update. Might have been that or maybe a cable fault (this has happened to me before...)
ahum...it is six posts up from yours 
here ... fenix-5-with-13-40-update-high-battery-drain
happy & safe sporting
@All
for those with and without battery problems
your battery is discharging rapidly ?
using a CIQ watchface ?
try this as a test....
use a native watchface and check the battery deplation
using OHR ?
try this as a test...
trun off / on OHR and check battery deplation
please report the outcome here in the forum and Garmin Support !
With Optical Heart rate : 3.2% battery drain per hour
Without Optical Heart rate : 0.4% battery drain per hour
happy & safe sporting
