Battery draining too fast

I am experiencing similar drainage and actually keep track of it atm because the battery life feels worse than my previous GI1 Solar so far.

I went from 100% on 19th at midday to 78% on 22. on midday, with several hours of sun exposure during the day (gardening, working in "garden home office") and around 20 mins of GPS activity daily. Pulse Ox manual only. 

It still means roughly 7% battery loss per day, equaling to measly ~14 days of battery life if their predictions are currently displayed correctly (apparently they are buggy atm). My math may be way off due to sleep deprivation, tho.

I buy garmin instinct 2 fitst day, i see battery display is 100%(27days)  today, when i finish first charge to 100%, battery display is 100%(10 day)

why not 27 days??i do not change any battery mode

+1 to this - looking at the same 6-7% battery drain a day - without any extra activities tracked, purely watch use, bluetooth disconnected, even changed to watch face without seconds refresh. It's never gonna last promised 28 days at this rate and that was one of main reasons I bought this watch. Hope this can be fixed within software and it is going to be fixed?

Guys, for everyone experiencing battery drain.

Go to garmin connect app

User settings

Set sleep and wake up times (AM) to something very close for example 0100-0115.

The reason you are experiencing battery drain is because of the backlight which turns on when you tilt your wrist.

Here is a facebook group I've created to discuss those problems

https://www.facebook.com/groups/485262243260088

thanks for suggestion, i got that backlight issue fixed with Do Not Disturb and Battery Saver on during night - so it's not that. Interestingly I lose 1% battery a night (7 hrs sleep or so avg) even though HR is on. And lot more during day - it really may be something to do with watch face refresh etc. but that's me guessing

9820003 said:

And lot more during day - it really may be something to do with watch face refresh etc

The display used in Instinct has an extremely low consumption, so that's an unlikely cause for some serious drain. The biggest consumer of energy is the GPS and the PulseOx sensor, so check out whether you did not mistakenly enable PulseOx during the day.

I'd also suggest performing a soft reset or powering down and up the watch - the consumption often unexpectedly increases after a firmware upgrade (v7.03 was released recently), and the reboot usually gets it back where it was before the upgrade.

Adriredrado said:

I am loosing around 5% to 7% battery a day. Is this normal?

Seeing in the Specs that the ideal maximal battery life of Instinct 2 in smartwatch mode is up to 21 days, 5% per day seems to be perfectly OK.

21 days - it's not true for regular sized Instinct 2, let's be honest; and no - no Pulse Ox or GPS on.

9820003 said:

21 days - it's not true for regular sized Instinct 2, let's be honest; and no - no Pulse Ox or GPS on.

Well, first of all, the Specs tell "up to", which means it is the best result that can be achieved under ideal conditions. And then, the battery discharge curve is not linear, so I'd suggest fully charging the watch, and then measuring how long it really lasts, before making any conclusions. 

yeah, working on that linear discharge. I am aware about 'up to' - but it's 25% of a promised lifetime - that 'up to', so unless there is some software glitch causing drain (which I hope it is), then I call it marketing BS. Hoping that someone on Garmin side reads these too and does something about it.
Meantime thanks @trux for trying to help and trying to manage my expectations - but they are still the same.