BlackZon #BL540043 USB Charger for Li-Ion Battery
Compatibility: Designed for BlackZon Slyder ST/MT and Smyter RC series 2S 7.4V packs.Input: Standard USB connection (recommended adapter output at least 2A).Output: 7.4V 2S balancing/charging connector at roughly 1.3A.
Plug the USB into a reliable 2A phone block or computer port.Never leave charging lithium batteries unattended.Disconnect the battery once the charge cycle finishes.