Vito wrote in message ...
bruce wrote:

I have a Maxum 2400 that has an unusual battery set up. I have 2 starting
batts on a 1-2-both-off switch, and then there are 2 deep cycle batts
connected to a power inverter in the cabin. I have learned that this is a
"poor mans gen set" set up. All batts were new last year, but now the 2
deep cycles are dead, showing 12.5 volts. What i cant figure out is how
they were to be recharged in the first place. ...

Could it be that a previous owner simply recharged them from shore power
using a charger? It's common practice for trolling motor batteries.

These are 2 battery faq sites I use alot:

http://www.amplepower.com/primer/index.html

http://www.vonwentzel.net/Battery/index.html