Charging 2 deep cell batteries

[JohnWester]

if i have two deep cell batteries hooked together in parallel, can I charge them both at the same time by just putting the cables on the one of them?  or should they be done separate?

[schwinger]

I hope this link works.. it explains both parallel and series charging

http://www.nycarecs.org/Connecting_Batteries_and_Chargers_in_Series_and_Parallel.pdf

[KATOMAN]

Big Fish;
It can be done but is not recommended, the charger gets too hot and it might ruin it.

[JohnWester]

I hope this link works.. it explains both parallel and series charging

http://www.nycarecs.org/Connecting_Batteries_and_Chargers_in_Series_and_Parallel.pdf

link not working for me...

got it...
http://www.nyc-arecs.org/Connecting_Batteries_and_Chargers_in_Series_and_Parallel.pdf

[JohnWester]

ok, so my question in the picture here... I attach the positive cable from the charger to the positive terminal on one battery and the neg to the terminal of the opposite battery...  right?

[schwinger]

That is what I see in the picture and that would keep everything in parrallel. I have never had to try this so I don't have any experience with it.  How are most boats set up in parallel or series? I know most boats with dual battery systems you just plug in to charge them and don't have to disconnect anything.

[JohnWester]

well parrallel is still 12 volts, series is 24 volts.  so it depends on how the boat is setup.

[HUNTER2]

In my boat and in my fish house there is a dual bank charger so it charges both battery's at the same time. Before I got those I put the positive on one and the neg on the other. Didn't seem to hurt them. I would suggest just buying a duel bank.