Rechargeable batteries 

Rechargeable battery is a electrical device for storing electrical energy in an indirect way via chemical energy and a source of direct current. The most famous is the lead battery.
Today, the batteries are required in all major technical systems, transport, signaling, security, modern computers, telecommunications systems and watches and calculators. There are many types of batteries used for various purposes. Li-ion - lithium ion, Lipo - lithium ion polymer, SLA - sealed lead acid