/vr/ - Retro Games

Found a fella with a a factory sealed GBA SP 101 on sale at a nice price. I'm quite fond of the GBA and i do not have a 101 model so this offer is quite tempting but due to it's never opened condition i'm wondering what are the chances the battery has leaked or if the years of inactivity have affected the battery life in some way, the box say up to 13 hours of battery life, i obviously don't expect for it to last that time but i'm curious about how time affects a GBA battery that has never been used. What kind of insight can you offer in this matter /vr/?