mschwett 

inspired by a recent conversation in another thread about batteries, e-bikes, etc.

for your most-commonly ridden bike, or the one you put the most miles on, count all the separate batteries in your bike, or onyour bike for the majority of your rides? if you always ride with a computer/head unit, that's one. if you use a phone instead, it still counts as one. power meter might have one, might have two. SRAM wireless 2x setup has four, i think? shimano 12 speed "wired-less" has three, GRX di2 maybe only one? if you almost always ride with a varia, tail-light, etc, count that if it has it's own battery. for an ebike, the main battery just counts as one but often there are others in the displays or control units.

for my most-ridden bike:

iphone 12 mini
left brifter
right brifter
di2 derailleur battery
left 4iiii PM
right 4iiii PM
garmin varia

ooops. forgot HRM.