If you go with SLA batteries they aren’t the lightest but they are cheap per KWh. You don’t need to use really big ones either depending on how much assist you want. The Cyclone motor just goes on a bracket underneath the frame or wherever you want. You don’t need to build a wheel. That is what I like about it as I can use it on virtually any bicycle drivetrain. You put the motor’s sprocket in series with your front and rear chainrings and away you go.

You could build a pack out of NiMH yourself quite easily or buy a pre-built pack. I didn’t want to spend too much until I determined if the motor was a good option. The motor rocks is all I can say! So as time and finances permit I’ll build a NiMH pack myself from big cells such as D or F and build a 10Ah or 12-13Ah pack. You can buy pre-built packs as well if you want from a variety of vendors and you’d need a charger.

The beauty of the SLA is they are cheap and any home car battery charger will charge them. Just don’t drain them too low.

Riding it you don't notice the weight that much if you have it stable. I have a QR connector to take the batteries of the bike quickly while in the tail trunk. Then if I do have to carry it up stairs its not too bad. I use pretty small SLA batteries as I only use it for the assist I need and to not run all the time. Even then it will go a long ways.

I think electric folders could be an amazing market and based on the personal emails I have already received today there is a lot of interest on this forum about it.