We recommend choosing the biggest battery available for the model.
Why?
Choosing the biggest battery available has its benefit. Such as you are able to use the electric mobility device multiple times before it needs a recharge, battery near full charged are able to perform better compared to when the battery is low and lastly with a bigger battery, you won’t need to worry about your device not having enough juice.
Make sure to look out for those units that have an easy detachable battery option. If the device has only one battery capacity, you can always buy a spare battery and swap it out when either one is flat.
It’s too cumbersome to keep having to recharge your battery every day. Having a small battery that will barely last you long enough for a two-way trip will only be a bad investment as you will need to worry about finding a charging station if you need to travel that extra 1-2 kilometers more. Sure it does have a small drawback, carrying a bigger capacity will add additional weight and you will be wasting energy to move both your device and your own body weight, but it outstrips the benefit as you can travel for multiple days before you need to charged it up again.
It will be different for everyone but a good range to start will be those that can travel 60km and above.