lifepo4 battery have excellent 4000~8000 cycles and up to 10 years service life.with internal, self-resetting fuse and user manual for safety information. compared with agm / sla batteries on the market, our batteries have higher energy density, more stable performance and higher power, and works well in various applications. lifepo4 battery has with bms (battery management system) with over voltage protection, over discharge protection,short circuit protection and overheating protection. it doesn't contain any heavy metals and rare metals,battwatt lifepo4 battery is ip65 level waterproof, to use both indoors and outdoors. our 200ah 12v lithium battery weighs only 1/3 weight of the same capacity lead acid batteries with no acid in the battery, it doesn't contain any heavy metals and rare metals, no pollution..syi