USB Wall Charger, Dual Port USB-DC Charging Cable & USB Power Adapter for Heated Products 7.4V Li-Polymer Battery

5V USB transfor 8.4V DC Link line
Compatible battery model: Works with 7.4V li-polymer battery SWB01 (2200mAh), SWB03 (3000mAh), SWB07 (4400mAh).
Charging(red light), fully charged(green light). The battery with overcharge protection, charging stops when fully charged.