Solar generators can use a variety of different battery types, including lead-acid, lithium-ion, nickel-cadmium, and flow batteries. However, lithium ion batteries are generally considered to be the best option for solar-powered generators.  This is on the grounds that lithium-ion batteries offer various benefits over other battery types, including a higher energy density, longer life expectancy, and lower self-release rate. Lithium-ion batteries are less vulnerable to harm from profound release cycles, making them ideal for sun oriented generators.