I purchased a baby nbox last year and used it 4-5 times. I used the same alkaline 9V battery without any issues. I think you can go 20-30 hrs. on a battery.
Anyway, I recently switched to a rechargeable 9V (Powerex 9.6V, 230 mAh). Ran it for a couple of recent shows without changing or charging the battery between shows. I have multiple Powerex so can swap whenever I need to, but wondering what those using the baby nbox are doing. Swapping after X shows? Swapping/recharging after every show? I plan on running this low profile setup more often, whenever I know I will be running just a single pair of mics.
Forgive the crosspost - TS plus 2 FB groups. There is no single place to get this info any longer.