LiTime Best LiFePO4 Lithium Solar Batteries - LiTime US
litime.com
Discover the power of LiTime lithium LiFePO4 batteries, perfect for trolling motors, RVs, fishing and marine, home energy storage, outdoors and etc.

If this type of post isn’t allowed, I can take it down. I am not affiliated with LiTime but I like their batteries since seeing Will Prowse’s teardowns of them. They have some smaller battery options for DIY projects.