Importer520 Black Micro-USB Car Charger for HTC Thunderbolt Brand new non-OEM Vehicle Lighter Adaptor. (12~24v DC) Short circuit protection.Intelligent IC chip inside recognizes a full battery and automatically switch to a saver. LED charging indication. Plug never heats or overcharges the battery.Can Charge Ni-Mh, Ni-cd and Li-Ion Battery.