Two batteries are better than one, but only if they are charged and ready for action. The ProMaster Dually Charger can charge two batteries simultaneously, or just 1 if required. It is compact and convenient with a USB-A input cable that neatly stores itself in the bottom of the charger. 

Since it draws power from USB sources, you can use the Dually Charger with a USB AC Adapter (not included), laptop, power bank, car charger, and more. 

Dimensions: 80 mm x 58 mm x 25 mm
Weight: 68 g
Input DC 5 V 2.2 A (Min) via USB-A port
Output DC 8.4 V
Output current 600 mA

Charging time is approximately 2 hours 30 minutes from depleted to 100% for 2 batteries charging simultaneosly