70 watts DC / DC charger, allowing the Spirit 1.0 Plus Battery to be charged from a 10 V ~ 30 V power source.   Comes with a 2-year warranty.  Package includes clips to attach to a vehicle battery as well as adapter for a cigarette lighter outlet. 
 
Input power: 70 W
Input voltage (DC): 10 – 30 V
Max input current: 7 A
Charge voltage: 30 V ~ 52.2 V
Constant current output: 1 A
Conversion rate: > 88%
Dimensions: 116 × 52 × 33.8 mm / 4.6 × 2 × 1.3 inch