Edge 130 battery life

The battery life on my Edge 130 is, in a word, dismal. I'm not using the backlight, I have GPS + Glonass set, and a heart meter, and speed/cadence sensors (all Garmin branded). Just 2 weeks ago I did a 90 mile ride and the unit was powered up for 6+ hours with some battery life left at the end. Since then, the unit has twice died after 2.5 - 3 hours of up time. I haven't changed any settings. I did receive a low battery warning for the speed sensor and replaced that battery.

I'm getting that exact same issue. The 130 is dying after about 2.5 hours, with or without phone linked via BT. GPS + Glonass, 3 sensors: speed, cadence, HR - all Garmin sensors.

WTH?!?

The times it's died at 2.5 hours the temp was around freezing or a few degrees above. Seriously? Using the 130 at that temp will reduce battery life by more than half??

My experience (I’ve got a 130 bought in April 2019, which I acquired second hand in mid-November) is that yes - not even close to 15 hours.

I need to do more detailed experiments but mine ran out of battery today on a ride. I last charged it 5-6 days ago IIRC and during that time about 5 hours in use. Probably 2-3 hours of those paired with a Bluetooth HRM. 

I also wonder if it was more than a coincidence that it died when temperatures were down at 2-3C

The gauge is inaccurate ... sometimes it actually goes up in charge! 

I reckon the device is not great at holding charge when off and probably needs charging up at least twice a week even if only doing 5-6 hours of use a week ...

Update: I did some careful measurement

Charged during Friday night, used it 3 hours on Saturday, used it an hour today (Monday), and it died. So 50 hours (?) elapsed and only about 4 hours in use, between the need for charging ... hmmm. It was about 0-1C which doesn't help but still ...

I charged mine 2 weeks ago, after my last ride.

Started it up yesterday in diagnostic mode* and it still showed 100%

Took if for a 4 1/2 hr ride and it stil showed 63%. Average temp was 18C.

So Ive got a very good battery, somehow use a lot less energy, or the temperature plays a crucial role.

I use a Ant+ HR sensor, BT phone connection and GPS+Glonass. Backlight is on low setting and minimum time (15s?) FW v3.50.

*In diag mode (startup with the 2 bottom buttons pushed in) you can read battery voltage and  charge (for what its worth).

Thanks for the tip on diag mode! Interesting … when I go to that mode it says battery is '4.16' and '92' which I guess means voltage of 4.16v and 92% charged? WHat was interesting is that in non-diag mode that 92 is shown as just 3 bars. The 92 was after a full charge between 10am and 5pm today, and then a 45 min ride home in 3C. Tomorrow morning I will try diag mode again and see how much it loses over 12 hours or so while switched off.

BTW - I turned off phone pairing earlier today too, to see if it makes much difference. If it does - hmmm seems a shame since a slick feature of the 130 is supposed to be the phone notifications ... part of me wonders if ...the 130 is a 'budget' device with most features of the more expensive devices ... but battery life is the key difference (especially given how small the unit is ... I guess the battery is small too).

I use a BT HR sensor, and plain GPS . Backlight is (now) on low setting and minimum time (10s) FW v3.50.