The four main types of solar batteries are lead acid, lithium ion, nickel cadmium, and flow batteries. Lead acid batteries have been around for the longest and are known for their low prices and reliability, but they require regular maintenance. A 400 amp-hour 6 volt battery can provide around 2.4 kilowatt hours of power. A three-day battery bank planned to provide 90 kilowatt-hours of electricity to an average American household. The previous example battery can provide2,4 kilowatt hours, while 38 batteries would be needed.