Have you ever had a derailleur or shifter battery die just before/during a ride?

A dead derailleur or shifter battery can be a ride killer. We want to know if it's ever happened to you.

By Jeff Barber
May 10, 2026

17 comments

Singletracks may earn commissions from affiliate links and/or receive products from manufacturers for review. Read our editorial guidelines here.

A close-up view of a small electronic component on a wooden surface, surrounded by wires and tools. The component features a black casing with a QR code and several small pins. Nearby, there is a red plastic cover and a piece of sandpaper, along with a pair of scissors and other wires.

Wireless electronic shifting systems promise easier setup and maintenance compared to cable-actuated drivetrains, but that convenience comes with a new dependency: battery life. And we certainly don’t have to tell you that a dead derailleur or shifter has the potential to end a ride if you forget to charge the battery.

If you answered yes, tell us how you dealt with the dead battery: did you swap in a spare battery, make do with a single gear, or just walk it out?

Close-up of a Shimano XTR rear derailleur being handled, showcasing its metallic components and a black button with an upward arrow. The background is slightly blurred, emphasizing the derailleur's detail and design.

Drivetrain

Are you running electronic shifting on any of your mountain bikes?

Drivetrain

Do you own a gearbox mountain bike?

Close-up view of a bicycle's rear derailleur and cassette, featuring a SRAM derailleur, with a blurred background of autumn leaves.

Drivetrain

Why aren't you running electronic shifters on your mountain bike?

Close-up view of a bicycle crankset featuring a black chainring, pedal, and chain, set against a blurred green background, showcasing the bike's components and design.

Drivetrain

Is Your Drivetrain 1x or 2x on Your Drop Bar Bike?

17 Comments

Please log in or create a free account to join the discussion.

thebadpixel Delaware // 2022
May 13, 2026

Cold weather + the shifter coin batteries has taken out some people on group rides.

4 reply

El_Scorcho42 Texas // 2024
May 14, 2026

shifter coin has got me more than the AXS battery!

2 reply

Zoso 2016
May 10, 2026

Keeping the RD battery charged is a no-brainer. It's the little battery in the shifter that can be ignored all too easily.

xcountry_rider 2010
May 10, 2026

I carry a charged derailleur battery and shifter battery in my kit. I haven't had to switch trail side yet. I have been using axs since 2022

3 reply

Joe Murray 2024
May 14, 2026

I bet anyone who uses batteries on a bike for awhile has had one go dead. I carry spares. I’ve got many kinds of batteries on my pack. Three kinds of coin disposables, and both a Shimano and SRAM rechargeable battery. There is no good warning system other than Shimano Di2 RDs have delayed shifting. SRAM figures riders will check the light is it’s green or red. Shifter batteries almost dead? Not sure. The systems are not user friendly enough.

gerryg New Mexico // 2019
May 15, 2026

I'll never go electric, thank you very much

zakuhn North Carolina // 2019
May 11, 2026

I had to ride out in the gear I was in on one ride. It was a local, weekly trail and I carry very little with me on those rides. The other time I had my spare with me. I always check the battery levels with the app before rides now and I always carry a spare AXS battery and coin cell battery for the shifter.

1 reply

dmandave Colorado // 2024
May 12, 2026

I nearly scratched riding DOOM this year on a dead Der but happened upon a fellow rider with a spare who bailed me out (in exchange I got his headlamp batteries charged with a spare pack)

OhioFatBiker Ohio // 2016
May 11, 2026

My drives are mechanical, but the option of "it happened to a friend I was riding with" has been true for me several times. Every time it does, it affirms my decision to stay mechanical. I accept that 90% of those failures could probably be tracked back to "user error", but I am a user who is also error prone. Any quality engineer will tell you if a human error can be introduced to a system, it will be introduced to the system.

Baureo Germany // 2021
May 11, 2026

I carry a spare battery for the derailleur and the shifter and I usually run down the derailleur battery until it won't shift anymore.

0 reply

kevin.weitz California // 2018
May 14, 2026

I have not had my battery die on me, but I have left my battery at home in the charger (It is one of the early Shimano removal batteries).

Exodux California // 2017
May 18, 2026

If you're conscience about it, it's never an issue, it's almost like charging your phone or bike computer. Sram has an app( I think Shimano does also) that gives you charge info and if you use that, you should never have a problem. Also, I keep my extra batteries charged.

Bonasa Vermont // 2021
May 14, 2026

Just once but keep a spare on the bike so no problem. Just swapped it out and kept riding.

John Ferguson 2025
May 12, 2026

My rides mostly start from my house, so if something is not working I swap bikes or do something else

singletraxistaken Colorado // 2011
May 14, 2026

FYI - I've had my battery go out mid ride a couple of different times. Careful on assuming if you start out with the battery working that it will continue to do so for the whole ride.

SKullman 2014
May 11, 2026

No, when I first got my Electronic derailleurs, I spent time testing, took a fully charged battery and road every day after work, not charging it until it died, Now I have a baseline. Have done this with every system I've had, so far have never run out of battery.

What is harder to gauge is the bar shifter. That thing doesn't read via the Garmin (wahoo, hammer, etc) very well. I've just gotten into the habit of replacing those every spring no matter what. So far so good.

I have 5 bikes with AXS, 1 with FA.

Ray Scruggs (Derby Rims) 2026
May 14, 2026

Yes, knowing my e-GX battery could run out while riding, I bought a spare e-derallier battery with my AXS GX e-der convertion, and a coin shifter battery to carry. I replace the coin battery each year before it dies.

A dead e-der happened a couple times soon after converting to e-der. And stopped riding for a few minutes to swap der battery, but was bummed that it could happen to interrupt a ride if I forgot to recharge every two weeks before it died on a ride.

However, soon I learned that my 3rd Gen Specialized Levo could display gear number and der battery percent, so reconfigured my Levo top tube display to include these in a secondary display. The main display I use while riding will also now display a warning message when the der battery gets down to 25% and repeat the warning message until recharged or replaced.

I haven't had a dead der battery to pause a ride since configuring the Levo display to since with the e-GX derail. Maybe there is a stand alone handlebar e-der display available for this?

Featured Articles

17 Comments