Battery selection for 215 Bowrider

[FullStamina]

My colleague at work got a used 215 Bowrider and surprise, no batteries came with it, maybe the previous owner must've pulled them or never had a real setup to begin with, who knows. He came to me because he knows I own a bayliner too but really its just a hand me down and in the area of battery and electricals, I'm really zero there, I decided to help him anyway but w'ere trying to figure out the best way to go, like to dual battery or not, he wants to use it for mainly weekend cruising and some tubing
So AGM worth it or nah ?, my own bayliner uses the dual battery but I'm really trying not to use mine as a yardstick because they're different models

Any help I would apppreciate, TIA

 

[Thamuz]

If your colleague is planning weekend cruises and tubing, the dual battery could give him peace of mind. AGM is nice for low maintenance and better deep cycling, but the cost can be meh. Honestly, for casual use, one good deep cycle could do, but the dual setup adds that safety net.

 

[fr13sorch1ps]

@FullStamina I can tell you that for any boat, especially a weekend cruiser that might be out on the water for a while or doing tubing (which usually means the engine is off a bit), two batteries are a huge safety net.
One for starting the engine (starting battery) and one for running all the accessories like the stereo, bilge pump, and fish finder (deep cycle battery). That way, if you run the stereo too long, you can still start the engine