eco-worthy-us via eBay has 12-Volt 280AH Eco-Worthy LiFePo4 Lithium Iron Phosphate Battery w/ 6000 Cycles on sale for $489.99 – 20% off when you apply promo code HOT20DEALS at checkout = $391.99. Shipping is free.

Specs:

• Battery capacity: 280Ah
• Battery power: 3584Wh
• Battery Voltage: 12.8V
• Max Charge Current: 160A
• Max Discharge Current: 200A
• Peak Point Current: 850A
• Max Charge Voltage: 14.6V
• Discharge cut-off VoltagE: 10V
• Battery Size (LxWxH): 17.8 x 9.37 x 8.7″
• Battery Weight: 61.7 lbs
• Number of Series and Parallel Connection: 4P4S

Features:

• LiFePO4 battery is lighter than Lead-Acid battery with the same capacity
• More convenient carrying, many mount directions, no leakage risk, safer usage
• Takes 14 hours to charge with 12V 20A LiFePO4 battery charger, about 6 hours to charge with 600w solar panel, and 14 hours to charge with 20A DC generator
• Has 3584Wh of energy, which can be expanded to 57.3kwh with 4 in series and 4 in parallel, perfect for RV, solar off-Grid system, boat, camper, marine, travel trailer, motor homes, etc
• Built-in 200A BMS, protect it from overcharge, over-discharge, charge over-current, discharge over-current, short-circuit, cell voltage self balance, high-temp discharge cut off
• Can be charged and discharged in 6000+ deep cycles, which is 3 times longer than lead-acid battery