Last summer, I ran Lynac Lithiums for the entire summer and cannot say enough about them! I never came remotely close to running out of juice even though we did run out of gas LOL eh ARKISONER? They charged up real quickly, I don't believe that it ever took more than about 4 hours to fully charge them each evening. If you do the math at $642 a battery and you'll probably get 10 years out of them.(They come with 7 year warranty) it makes sense to spend the extra money now and never have to worry about power. BTW I also noticed more power with my trolling motor.
Anyway a great Canadian company out of Thunder Bay with great customer service! If you're looking for new batteries, check them out www.lynaclithium.com