Question. I am new to the Sram Axis electronic shifting world with Apex on my gravel bike and Rival on my road bike. I have noticed that when I check the battery levels for the front and rear derailleurs on the Sram app before I head out on a ride it will show a full green circle for each. Sometimes, then 20 minutes into the ride, I will get a low battery warning for the derailleur. I have noticed this on both my gravel and road bikes as I got them about the same time. I have also replaced the battery and still have the same issue. My question is this. Is the battery indicator on the app supposed to show gradual decline in battery life or is it more of a three level indicator showing full, then getting low, and then dead.
The app only shows the current battery levels when connected to the components and the components are awake. Below each in the list on the app, it will say something like shake the bike or “Press the AXS button” if the connection is not active. Those go away when the connection is active. Personally, I just rely on the lights on the components. If the RD shows green, I’m good, If it shows red, I’m still go for my typical ride of a few hours. Flashing red needs charging first. I press the AXS button on the levers and green means good to go. Many will carry a spare AXS battery and coin cell just in case. At this point, I prefer mechanical will try to stick with that on future bikes where possible.
It took me a little while to figure this out, too!
“Low battery” means about 20% battery left.
Based on SRAM’s webpage, for road derailleurs that means about 12 hours of riding time remains.
You could easily go for your ride and charge the batteries after you got home if you wanted.
I know that I’d forget to do that, so I have a single spare battery that I carry with me.
Whenever I get the low battery warning, I swap that battery for the one marked as low.
The one I swap out becomes my “spare” battery.
I charge that when I get home, and then go out for the next ride.
If both front and rear batteries are low, I swap out the rear.
For me, it’s super easy to remember. It also means that I’m charging each battery as little as it needs to be based on how often I’m riding…
If you have 2x on both bikes, then a single spare battery might be a good option.
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