RJ: Replace them with a CTEK charger. The model I have is the 3000 (maybe 3300 I forget). It's a great charger. Kuryakin sells them. The 800 model is just for bikes. Mine can do cars too. Left the dome light on in the F150. It brought it up overnight.
Damn, their video is very convincing.
Might have to look into this further for my other battery needs.