Ebay offers ECO-WORTHY 12V 100AH 1280Wh LiFePO4 Lithium Battery Low-Temp For RV Solar Panel for $127.99 (reg. $189.99) after code with free shipping.

Apply Code: PREZ20

Product Description:
[Low-Temperature Charging Protection] 
TheECO-WORTHY 12V 100Ah lifepo4 battery has a built-in enhanced BMS withLow Temperature Protection, specifically designed for unparalleledperformance in harsh cold conditions. Charging would be cut off toprotect the battery when the surrounding temperature falls below -7 ° C±5 ° C (19.4°F ±9°F). Charging resumes when the temperature returns toabove 0°C (32°F). Ideal for cold winter use in RVs, cabins, off-gridinstallations and marine applications.
 [10-year life & Up to 15000+ cycle]
ECO-WORTHY12V 100AH LiFePO4 Battery contains 3000~15000 cycle times, each lithiumbattery can run for more than 10 years, which is equivalent to 3lead-acid batteries.
[Wide Application]
ECO-WORTHY100Ah lithium iron phosphate battery has 1280Wh of energy, which can beexpanded to 20.48kWh with 4 in series and 4 in parallel, perfect forRV, Caravan, Marine, Boat, Overland, Backup power supply and Off GridApplications.
[Lightweight & Easy Installation] 
ECO-WORTHY12V 100AH LiFePO4 Battery is lighter than Lead-Acid battery with thesame capacity. Our 100ah LiFePO4 battery weight is 23 lbs, only 1/3 ofLead-Acid battery. More convenient carrying, any mount directions, noleakage risk, safer usage.
[BMS Comprehensive Protection]
Thelithium battery has a built-in Battery Management System (BMS) that canprotect it from overcharging, deep discharge, overload, overheating andshort circuit, and low self-discharge rate.