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SRAM AXS batteries are easily handled by carrying a spare. The coin batteries in the shift levers should last over a year, so annual changing is a good idea, to avoid surprises. The derailleur battery life is good, but I carry a spare. I use the spare to replace any dead battery and then charge the dead battery and use it as the new spare. Making a shift with both front and rear derailleurs before a ride is a good idea to verify the light is green. That's most easily done with the bike in a work stand. I've caught several red light warnings that way and not yet had a battery die on a ride.
The new bike computers that drain batteries quickly are probably the easiest to forget to charge. I still use the old style with 2032 coin batteries that usually last a year, but not always.
I have 4 coin batteries on my bikes and two rechargeables for the derailleurs on each of two bikes.
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