Bioenno Power makes a true deep cycle lithium. I would caution using lithiums in parallel. There's a higher chance of damage to one of the batteries that way, which could be catastrophic. RC style lithium battery packs like that are meant to have a much higher discharge rate than what we could pull off of them in a kayak. Contact Anglers Pro Tackle in North Richland Hills I have been working with them to get set up as a dealer. I spoke with Bioenno about my current set up which is a 55 ah AGM sealed battery that weighs around 40 lbs. It will only give me around 6-8 hours before I start getting low voltage warnings from my graph. Bioenno advised I could use there 30ah battery and get more hours use than my current set up and the battery is much smaller weighing only 10 lbs.
Native Titan 13.5
Angler's Pro Tackle Kayak Fishing Team