Solar Universe India Lithium Ferrous Phosphate (LiFePo4) Battery of 6.4V-6000mAh with inbuilt BMS for 6V Solar & EV Applications, Lithium Solar Battery has greater cell density than lead acid, at a fraction of the weight and it has less cell density than lithium-ion. So, this makes this battery-less volatile and safer to use. 6.4V-6ah LiFePo4 Battery with BMS Lithium Solar Battery (6 V) can be used in high-temperature environments, whereas lithium-ion cells should never be used above 140F.India's Solar Universe Lithium Ferrous Phosphate (LiFePo4) Battery of 6.4V-6000mAh with integrated BMS for 6V Solar & EV Applications. Lithium Solar Battery has a higher cell density than lead acid, at a fraction of the weight, yet it has a lower cell density than lithium-ion. As a result, using this battery-free volatile is safer. LiFePo4 Battery with BMS, 6.4V-6ah While lithium-ion cells should never be used at temperatures above 140F, lithium solar batteries (6 V) can be used in high-temperature conditions.