4 Volts 5Ah lithium-ion with BMS

-4 Volts 5Ah Lithium-ion battery with PTC, CID, PRV internal protection. -Direct replacement for lead acid battery -With built-in 6 ampere BMS for overcharge, overdischarge, short circuit protection. - Can last more than 4 years compared to lead acid with only 2years of lifespan. -Lithium-ion has 500 cycles (charge/discharge cycle) and lead acid has only 100 cycles - Can be use to any 4Volts operated appliances -Tested before shipping -Will not affect by sulfation that will cause of early failure. -Best for emergency lights and rechargeable fans due to consistent Voltage output (4 Volts ). Unlike lead acid that the Voltage output decreases as the charge decreases affecting the load -Fast Charging compared to lead acid battery