the batteries support (4s) series or (4p) parallel connection to scale the system, and provide increased energy (up to 48v or 1200ah) as needed. 12.8v lifepo4 lithium battery can be installed at any angle and requires zero maintenance. our ecson series lithium battery cases and sealing craft are in the state of art at ip65 waterproof standard. they are ideal batteries for marine, boat, kayak watercraft. the lithium battery features an elegant bms that provides multiple protections to keep the battery operating safely: -overcharge protection function -overdischarge protection function lithium batteries' extended lifespans mean their cost-effectiveness is actually much better in the long run, so if you can foot the expense upfront, it's worth it..syi