I carry a spare Nikon battery too and ditto. Never used up my Fuji X100V battery either though, which is just as well since the camera doesn't come with a charger so really no point buying a second battery as I have to use the camera as a charger. Yes, I could charge them in turn but once they've both gone then...well, you get it. No, I'm not buying a charger, I already had to buy a weatherproofing kit for the camera; enough is enough. Nice camera though, if a bit unreliable (had to get a warranty replacement and the replacement has a minor fault on it too).