A spare lithium battery, in case you already have an electric motor or if you want to extend the range. It's 122 AH, working with 12 volt. Estimation of range:
Maximum power : 2,8 hours
50 % power: 5 hours
25 % power: 10 hours
15 % power: 17 hours
The battery is integrated in a waterproof and shockproof case, which makes it very durable. In the price is a backpack and charger included. The battery has one year warranty. Furthermore the battery can be recharged 500 times without losing capacity. And for the
technically savvy people, the peak discharge is 120 Amp, this makes it possible to connect most of the 12V motors. When in doubt, please contact me.