How do I charge two marine cycle batteries at 24v?
I've built a mobile stereo ice cream cart that I have posted here on instructables. https://www.instructables.com/answers/Got-any-cool-ideas-for-our-Arduino-run-LED-dance-f/
We've been having a hard time with our SLA batteries. We have two 12v banks of three 7.2 sla batteries, run in series to make 24v. (six batteries total) We then use a car charger on trickle to charge the two banks separately. This is a pain, and the cells have been swelling.
We desire a bit more battery life. (currently at about 6 hours) and simpler charging.
My thought is two small marine cycle batteries (maybe 40 Amp/hrs each) and some sort of 24 volt charger.
Would this work? Is there a better way to go?
Extra Points for Light, Cheap and Simple.
Thanks so much!
BTW totally open to a battery lecture, or to get pointed to a good read. I feel like I need to get schooled.