Ingpar Deep Cycle 12v 100ah rechargeable Lithium Battery for Use with Pv Solar Panels,Smart chargers wind Turbine and Inverters Battery backup

This battery is rated to -20F. The battery charges to 12.75 Volts. It has built in over voltage and under voltage protection. I contacted the company in China. With Fed-Ex shipping ten batteries cost $3,800.00 and they arrive in about 4 weeks at the longest.. Since ten batteries represents about a day worth of power I ordered 20 more. It is my belief that a solar system needs at least 3 days of power. Finally my cost is $380.00 per unit, and is a significant savings over the list price of $600.00. I would point out that deep cycle lead acid batteries should only be discharged -10% of capacity, where as a lithium battery can be discharged to -50% of capacity. With a 10 amp charger it takes obout 5 hours to top off. At full discharge (-50%) I estimate 10 to 12 hours to charge fully. Have a good day burning daylight!