So I nabbed a pre 3 off of ebay and my friend gave me an extended mugen battery for it. I bought a spare seeing as how the pre 3 will be my daily driver for the foreseeable future and I suddenly remembered something i read, that the battery health for will decrease even if not in use (pretty sure it said lithium ion). this worries me because the point of having a spare would be to have a healthy battery when your current battery dies.
can anyone confirm/debunk this? thanks in advance