Low Self-discharge:AA size solar batteries 1.2v aa 400 cell Embedded seal structure expand the space of crystal lattice, make more room for hydrogen,solar rechargeable aa batteries 400 MAH Cell batteries will holds 80% power after 3 years Number of cycles:1.2v Double A batteries 400mah dont contain Hg/Cd/Pb,NI-MH recharged 1200 timesRechargeable battery can replace 2100 alkaline batteries Operating environment:nickel hydrate 1.2 volt aa Rechargeable NiMH Double A 400mah batteries is better high-temperature performance than other types of batteries, can be used from -4 to 140, and can be charged from the sun even in the snow aa battery pack:0.55 inch *1.97 inch,16 x 1.2v 400mah ni-mh rechargeable aa solar batteries for outdoor lights,Designed especially for solar lights,It can be charged by solar energy and can be fully charged again in 5-8 hours in good weather Widely used:400mAh aa solar batteries for outdoor solar lights,solar garden lights, landscape lights, lawn lights