Hi CG, although we do not consider ourselves to be geniuses, we do know quite a bit about electric scooters and can help you with your electric scooter modification goal.
To increase the range of an electric scooter is incredibly simple. All that needs to be done is to install a larger battery pack, or an additional battery pack.
One way to do this would be to replace the existing battery pack which is made up of three 12 Volt 8Ah batteries with a new battery pack made with six 12 Volt 9Ah batteries. Our 9Ah batteries are the exact same size as the original 8Ah batteries so they will fit perfectly. Then stack one set of three batteries on top of the other set of three batteries, and use wood boards to space the footplate off of the scooter's frame to allow room for the extra batteries.
Two packs of three of the batteries would need to be wired in series, and then those two packs wires in parallel to make a 36 Volts battery pack.
A larger battery charger would then be needed to recharge the larger battery pack. A 36 Volt 3 Amp battery charger would be a good size for this new battery pack.
I would expect for the range to be at least doubled with a new battery pack like this.
Oh and by the way, even though riding an electric scooter on the sidewalk may be illegal in most places I do not consider it to be bad because there is nothing bad about being safe when you are riding a scooter. I believe that riding bikes and scooters should be allowed on the sidewalks when no pedestrians are present. That is just my opinion though.
Sorry for dropping in late, but I'm the process of purchasing that very 6-battery pack upgrade on my razor ecosmart for added run-time and speed. Just one thing, I would greatly appreciate a diagram to wire this battery set up before I order from you guys, just want to be on the clear about the set up... thanks ahead :)
During the process or after you finish the six battery modification you are welcome to post pictures of it here.
on this same topic wouldn't upgrading to lithium batteries increase range but negate the need to increase voltage?
Question. I want to do the same by increasing the range but I want to buy a total of 9, 10ah 12v batteries. Would I be able to do this with a 3 Amp charger and how would you wire the batteries in parallel to still keep it at 36V?