This is the SOLARPEX 12.8V 300AH Deep Cycle Rechargeable Lithium Iron Phosphate (LiFePO4) Battery, with 6000+ cycle life and 36 months warranty. It stores 3.84kWh of energy (12.8V x 300Ah), making it ideal for 12V solar systems, home backup, off-grid power, and RVs. The LiFePO4 chemistry offers built-in safety, no maintenance, lightweight design, and deep discharge capability compared to lead-acid, with CE and RoHS certification.