Depends on the type of battery. A typical NiMH battery can self-discharge up to 10% of capacity on its first day, and up to 1% per day afterwards at room temperature. This is why most players charge their batteries the day before a game.
I can't really comment on LiPo batteries, other than they can hold their charge at near capacity for several months.
VFC SCAR-L - VFC SCAR SSR - KJW Hi-Capa 5.1 - CAW M79
The Three Sisters - WE G39 E/K/C
Originally Posted by kalnaren
Stalker stays where he is.
His BB's fly across the country to hit their target.