I'm guilty of it, myself....

....and so far haven't had any problems....but, for the most part, I try to take them out when their done just to be on the safe side.
The only problem we've had with a battery is when a supplier accidentally sent us a
mod with the battery installed...when the package arrived, it was smoking, so we quickly ran it outside and disengaged the battery.
mod was relatively okay, but the battery was ruined. It's a good thing we were here when it arrived...there's no telling how long it would have taken it to catch fire. So if you're sending a mod &
batteries to someone, be sure to NEVER send the battery INSIDE the mod!
