Battery completely drained 70% overnight

I'm currently traveling and fully charged my watch before the trip. It has been draining a little faster than usual recently, but it still should have lasted for the next 4 days. However, I just woke up this morning and viewed the morning report as usual, when immediately after the display went dead. I was able to get it to reboot and it's showing 0% battery after it was showing 70% when I checked it before bed last night.

I have a Fenix 7s Sapphire Solar and it's only 2 months old. I haven't changed any settings recently. I think I have the lastest firmware version, although I can't check since I have no way to recharge it until I get home and am now without a watch for the remainder of my trip. All connections were off

What could have caused this? Is it a fluke or am I going to have to try to get it repaired or replaced?

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0 Svenh77 over 2 years ago

Disable bluetooth connection to your phone, you might make it until you get home. Then search this forum, there are multiple possible fixes mentioned.

0 Dzym over 2 years ago in reply to Svenh77

I always have bluetooth off unless I'm actively synching. It's at 0% and will shut down almost immediately, so no chance of using it even as a dumb watch for the next few days unfortunately.

I haven't seen any applicable fixes, it seems like most related posts mention turning off features I already have turned off. Hopefully resetting once I'm able to charge will fix it.

I keep looking at my wrist for the time and becoming annoyed, I've worn a watch every day of my life since I was 5

0 MisterFrag over 2 years ago

Is it possible that something was in contact with the touchscreen overnight and kept the backlight on?

0 Dzym over 2 years ago in reply to MisterFrag

It was in sleep mode, so the touchscreen was off, although it still might be possible that some of the buttons were pressed by a weird wrist angle or something. I did wake up a couple times in the night and didn't notice the backlight on though, so seems unlikely.

0 Dzym over 2 years ago

UPDATE

I got home and fully charged, then double checked all the settings (bluetooth off, pulse ox manual, etc) that have been mentioned in regard to battery life. I also changed the heart rate monitoring from 'smart' to '1 second' based off of the heart rate accuracy thread.

i don't know if it's a semi-reset from the battery drain, or if the smart heart rate was causing an issue, but my battery drain is better than ever now. It's the same usage pattern as before my trip and has only used 4 days worth of batter in the last 5 days since the full charge. Hopefully this continues!

0 AgentMax over 2 years ago in reply to Dzym

There is no „smart heart rate“.
This option does only affect activities and how often the data (of all sensors) is written into the workout file.

It does not change anything in the smartwatch mode.

0 Dzym over 2 years ago in reply to AgentMax

I mentioned it because it was the only settings change I made, it's always possible that something in the firmware is changed in unpredictable ways during an update

0 ramon_73 over 2 years ago

I tend to do a power cycle every now and then. Especially on long charges, eg from 50 to 100%.

Seen it more than once the battery would just drain for no reason. When travelling there's always a Garmin cable in my bag, even when just 1 or 2 days away.

0 Vizi over 2 years ago

My Fenix 7 often drains overnight if it shows less than 30% battery left. But not always, so I could not figure out the reason

0 S4ndor over 1 year ago

I have my fenix 7 sapphire solar for 2 years already and had this issue a few times. Yesterday when i got to bed there was 14 more days worth of battery in the watch, in the morning the watch was completely drained off. 0%. Had this issue at least 4 times already and i cannot figure out what sees to be the problem. It is a glitch. I did not changed any of my settings for years and usualy the watch holds the battery very good.

Garmin, there is a resolve for this issue?