Good question. I've never worried about the battery as I used it pretty much exclusively in my truck with an integrated Alpine connection. I haven't used it in a while, so I'll have to fire it up and see.
Ha ha... I don't mean to start a bidding war... so I don't plan on jacking up the price ;-).
I'm testing out the battery now... I charged it fresh this morning, then started an audio book and I'm letting it run. Going on 8 hours straight so far, so the battery appears to be working great.
FJ4 Tahoe, if DWH doesn't want it, its yours for $45.
FYI, I'll be out of town until next tuesday... so if you don't hear from me, that's why.