I love my Optima's - they have plenty of juice left long after I've tired of fishing. I've gone through multiple 3-4 days of fishing 6-8 hours each day without charge (camping) and have yet to keep me from fishing. When my big motor wouldn't run I've fished all day with TM only - certainly don't cover the same distance - but you tend to find sweet spots you fly by with the big motor running - and my batteries hold up just fine - better than me in this heat!
Optimas are not the least expensive option - but when this sets goes I'll replace them with Optimas.