Douglas Guardian DG12-100UTH 12V 100A Ersatz LiFePO4 Akku (Prismatic)

This battery is made of Lithium Iron Phosphate (LiFePO4) making it a safe and durable choice for all your power needs. Ultramax LI100-12PRI 12V 100Ah LiFePO4 (Prismatic) Battery 4000 Cycles. To be even more cost-effective, LiFePO4 batteries are among the longest lived batteries ever developed.

eBay