Upgrade the power source of your Nokia phone with this high-quality battery BL-4CT. It is compatible with various Nokia models such as 2720, XpressMusic, 5310, 5610, 5630, 6600, Supernova, and 7210. This internal battery is made of Lithium Ion material and has a capacity of 860 mAh. It comes with a slim design/finish and has a single port for connectivity. This OEM battery has a voltage of 3.7 V and is suitable for use in California without any Prop 65 warning. Although there is no manufacturer warranty, this battery is reliable and will keep your phone running for a longer period.