3.2v 500ah lithium lifepo4 long life battery with 8 years lifetime.4000 cycles.longer service life. its service life can up to 8 years, lead-acid's service life only 3 years. lightweight. its weight is only one-third the weight of lead acid batteries.more stable and safer. this lithium iron phosphate batteries the superior high temperature and storage performance make lifepo4 the most suitable one for 12v li-ion battery positive material. lithium iron phosphate batteries are new materials, environmental protection, environmental pollution, has passed rohs testing we can customize any capacity battery and size you wantwe can produce all the batteries listed belowif you have requirments,please write to me,thank you.syi