Adding a second spare battery doubles the range of the Firefly by an additional 15 miles / 24 km (stop and go and hills) to a total of 30 miles/50 km!
Lithium Polymer batteries are the best quality available in the industry, lasting 5-10 years or more when properly cared for.
Charging Time ~4 hours if battery is fully discharged.
Charge your second battery with the charger that came with your Firefly or optionally order a second charger to simultaneously charge both batteries and be ready to go again in only 4 hours!
Batteries are warranteed free of defects in material and workmanship for three (3) months from the date of purchase.