I have a Nikon Z9 with a EN-EL18d battery (both purchased new in 4Q22. I have used them pretty much every day since then and recharge battery every night. In last couple of weeks it seems the battery drains quickly. Last night at bedtime it was fully charged at 100%. When I got up this morning the charge level was 78%. And,camera was OFF all night. Any thoughts on why this is happening? I have never calibrated battery (in fact, I did not know you could). I am calibrating now, but I don’t know if that will help (and calibration seems to take a long time). BTW...I have ordered a new battery from B&H and it arrives Monday. I never had a spare battery due to hight cost, but definitely need one now.
Any thoughts?