Quick battery question.

[Speedling]

So my boat has been running the original batteries since 2008. Time to upgrade. I bought from my local auto parts store two type 27 batteries. One is a starter and one is a deep cycle.
I have a Perko switch with 1, both, 2, off.
I will put the starter one on 1 and deep on two.
Is there any reason i can't or don't want to put them together when running or charging by driving?
Also, i assume i start with battery one, but then can i switch to both while running to charge?
Amps on deep cycle is what i want as well i believe.

Sorry for the noob questions but i never installed specific batteries for starting and deep cycle before. In a car the battery was just the battery and i have a 1/2 farad cap that can be used for the stereo like i would in a car as well.

 

[tdonoughue]

No problem coupling them to charge while running. Only caution is if you hook them to a smart charger. Then it should be a two-bank charger that can treat the two different banks individually. Then you don't want them coupled, as it will defeat the smart charger.

 

[Speedling]

I typically just charge my batteries separately when using a charger. I was more worried about vehicle running type of thing.