# Battery thickness for di2 9270 shifters **URL:** \ **Category:** Equipment\ **Created:** [July 5, 2025, 5:18am UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315 "2025-07-05T05:18:00Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mikbik](https://avatars.discourse-cdn.com/v4/letter/m/5daacb/32.png) [@mikbik](https://www.trainerroad.com/forum/u/mikbik)\ **Post date:** [July 5, 2025, 5:18am UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315/1 "2025-07-05T05:18:00Z")
My wife’s Canyon. Di2 12 speed w/ wireless shifters. 2 years on old batteries. She had a spare set from a year ago, ‘good till 2032’ Replaced batteries on R and L shifters. (Lights on both sides tested green, but 2 years old) Right shifter worked fine left did not. Checked voltage. Old battery 3.07v, new battery 3.3v. Put old battery back in L shifter, now it works fine. Measured thickness of old battery - 3.2 mm. New battery 3.02mm Both old and new are Duracell, CR1632. I suggested taking a bit of foil and folding it to make it a tad thicker. If she has to change batteries on the road. Anyone else have an issue w/ battery thickness? I suppose I could tweak the contacts inside the shifter, but… not my bike. Just wondering if this is an issue at all or just her particular bike ---
**Author:** ![Ryan\_Powell](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/ryan_powell/32/40990_2.png) [@Ryan\_Powell](https://www.trainerroad.com/forum/u/Ryan_Powell)\ **Post date:** [July 5, 2025, 5:42am UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315/2 "2025-07-05T05:42:01Z")
Sometimes those batteries have a bitter coating that can prevent a good electrical contact that needs to be sanded off ---
**Author:** ![Saddlesaur](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/saddlesaur/32/33237_2.png) [@Saddlesaur](https://www.trainerroad.com/forum/u/Saddlesaur)\ **Post date:** [July 5, 2025, 2:17pm UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315/3 "2025-07-05T14:17:49Z")
Yeah. Some Duracell batteries have a bitter coating to reduce the chances of a child swallowing them. It can interfere with good electric contact. The the coating can be removed with isopropanol, though it’s better to get batteries without it. ---
**Author:** ![mikbik](https://avatars.discourse-cdn.com/v4/letter/m/5daacb/32.png) [@mikbik](https://www.trainerroad.com/forum/u/mikbik)\ **Post date:** [July 5, 2025, 2:44pm UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315/4 "2025-07-05T14:44:29Z")
I did wipe the new batteries w/ alcohol, but maybe a little more aggressive method like sanding w/ very fine grit might work. Thanks for the input. ---
**Author:** ![Saddlesaur](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/saddlesaur/32/33237_2.png) [@Saddlesaur](https://www.trainerroad.com/forum/u/Saddlesaur)\ **Post date:** [July 5, 2025, 7:22pm UTC](https://www.trainerroad.com/forum/t/battery-thickness-for-di2-9270-shifters/104315/5 "2025-07-05T19:22:38Z")
I don’t think abrasive is necessary. They are intended to work with the coating, it’s just that some devices seem more sensitive to it than others. For the heck of it I looked up the nominal dimensions for a CR2032 and got 20mm x 3.2mm, both +/- 0.2mm tolerance, so your 3.02mm battery is still within spec. I know on sram shifters, it’s easy to bend the edge contacts and have problems. IDK about the Di2 shifters.