Lithium phosphate battery. The power tank supplies your telescope with electricity on the field. It is smaller, lighter and safer than lead or lithum batteries. You can also charge tablets or smartphones via the USB outputs; Red and white light-LED's help with assembly and dismantling. Up to 20,000 charging cycles- four times more than lithium-ion batteries and seven times more than lead gel batteries. Environmentally friendly - without poisonous heavy metals. This model does not work for the Sky Watcher EQ6 telescopes. A security circuit is installed in the PowerTank lithium that automatically switches off the battery after about an hour if the battery does not detect a current consumption of at least 250mA.
