So much for the DI2 battery datafield on my Garmin. The left hand shifter showed full bars on the datafield during my ride today. By chance I looked at it this evening and it’s down to 1 bar and indicating critical. Anybody else had this sort of problem. I’m not bothered about the life - they’ve giv…

On my Wahoo Roam, the DI2 shifters only report as Good or Low. When my RD shifter started reporting low I road another ~10 hours before changing the batteries and they didn’t die on me. I had kept forgetting to buy batteries for them and was always prepared to use the app to change the shifting on …

The only thing I own that gives sufficient notice is my varia. Why the shifters and derailleurs can’t similarly send me notices well in advance of dying (or at all) is beyond me.

I just got the notice to replace one of mine for the first time and while I was looking up which battery model I needed to buy I noticed that the Shimano manual says when you get the low battery warning you should replace ‘within a month,’ so that seems pretty reasonable for a binary indicator that …

Thanks for all the replies. I just think that going from full bats to one in an hour or so doesn’t leave me with much confidence that the one bar will last very long On another note the main DI2 battery doesn’t seem last anywhere near as long as my old 12 speed one

[image] carytb: from full bats to one in an hour or so It’s not designed to transmit a true battery level, only a binary ‘good’ or ‘replace’. “Full” = 11-100%

On my Garmin 1040 it shows 5 bars which I took to mean each bar represented 20% of charge [IMG20250314064453]

That could just be how garmin is choosing to display all battery levels regardless of what kind of data the devices are sending. As far as I can tell the shimano shifters only transmit good vs replace, but I’m also making an assumption there. Best person to check with to confirm is @terry_bettersh…

[image] carytb: Anybody else had this sort of problem. I’m not bothered about the life - they’ve given me 12 months and 2000 miles, just the amount of warning. Yes

I suspect so, yeah.. I do use a Garmin myself, but haven’t had to replace the batteries on my ST-R8170 shifters yet. But yeah… the shifters report ‘low battery’ when under a certain voltage. I think Garmin just takes the same status and displays either all bars or one bar. :slight_smile:

Apple played that game with their buds years ago, and I had a dive computer that played that stupid game too. Well, yeah, you have some battery left, so All’s Good. Then: PFFFTTTTT Oh, the battery died!! The former was annoying, but the later was enraging. It used 2 really odd batteries that sourcin…

DI2 12 speed shifter batteries

Equipment

JoeX March 14, 2025, 11:27am 10

Yes

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DI2 12 speed shifter batteries

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