Originally Posted by
DaveSSS
SRAM shifter batteries don't need to be replaced every year and neither do Shimano batteries. I have four SRAM batteries that were manufactured four years ago and they still work fine. I'd expect more like 5-7 years of life. I've got batteries for power tools that are 12 years old and still working.
It's a pretty low and undemanding duty cycle for a modern battery. So not something to worry about. But I do prefer SRAM's multi-battery approach. If one mech battery dies at least you can prioritise the rear mech (or carry a spare battery if you are really paranoid or on some epic multi-week tour away from civilisation). The shifter coin-cell batteries are fit-and-forget for a couple of years and simple to change. These are certainly not reasons to avoid going electronic. I always found cables more of a hassle overall and removing them makes for an easier, cleaner installation.