I use a dessicant drier and I don't take the batteries out. I do open the battery door all the way. It might depend on how your battery door is designed -- I've heard some people say when the door is open the battery is still touching the contacts. When my doors are open the battery is only touching plastic. I've tried removing them, but it made no difference in the life of the batteries. Either way, they last 8 to 9 days.
Freq: Right Left
250 40 60
500 50 65
1000 50 60
2000 45 45
4000 65 70
Right: SRT=50 dB, WRS 92% at 70 dB
Left: SRT=60 dB, WRS 80% at 80 dB
Had stapedotomy on left ear in May, 2015. Prior to that had a severe/profound loss across all frequencies in my left ear.