ZunSolar 40Ah 12 Volt Power Plus Series Solar Battery Ideal for off-grid solar rooftop installationsC10 batteries for charging and discharging in 10 hoursTubular plate technologyOccupies less floor space This 40Ah 12 volt solar battery from ZunSolar is based on Tubular Plate Technology and is ideal for off-grid solar power systems with low load.The battery is C10 and thus charges and discharges within 10 hours