The SRAM Red eTap® battery is the power source for the eTap® system. The same power unit is interchangeable between front and rear derailleurs. This battery provides up to 1,000 kilometers of riding per charge
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Just a spare battery
I've never had a battery on eTap run out of juice on the road, but with some longer multi-day tours coming up (with no easy access to recharging), a spare seemed a good idea. I also carry an extra pair of CR3032 button cells just in case a shift lever battery goes out.
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