.. sorry pictures are huge but I don't know how to make them smaller
Yes when referring to measurements ID does stand for inside diameter, and the ID of the sprocket in your photos definitely looks to be 8mm x 7 mm.
Our 9 tooth sprocket for #25 chain with 8mm x 7mm ID has a thinner collar than the sprocket in your photos however we do sell washers that could be used to make the sprocket thicker if necessary. Here is a link to the page that we sell the SPR=NW8 nut and washer on:
Oh thanks for that. There is quite a difference in width so I might need those extra washers.
Yes, the sprocket is held onto the motor shaft with a c-clip. There is also some kind of thin, flexing washer padding vibration between the c-clip and sprocket.
No problem, I'm happy to share more photos to anyone who is interested.
Yes, it seems the scooter has quite a unique design which I like and well thought out. It's well designed, but unfortunately they have used cheap materials to make the parts, so because of this, it does seem to need a fair bit of maintenance - parts often needing to be replaced/repaired, so I probably would not recommend this scooter to it anyone who is not interested in DIY.
Actually I have ran into a problem - a few days ago I was riding it on a hot day when the power cut off and it wouldn't start again. When I tried to charge it, the light on the charger just flickered from green to orange. I took out the battery and found that one of the cells had leaked/corroded (picture attached).
I don't know if I should try to replace the whole battery or just the dead cell only. I'm guessing it would be easier to replace the dead cell if a correct replacement can be found. The battery seems to be made up of 25x 18650 lithium batteries (65mm x 18mm size). I'm pretty sure they are the 1600mAh type (according to my calculations).
Llafra, may I ask where you got your battery replacement?
I know this battery issue is off the topic of hill climbing, but I am not sure what to do from here.. I have received the sprocket and I'm am keen to try out this mod, but unfortunately I can't go any further until this battery issue is fixed. Any suggestions are appreciated.
Replacing one of the cells might work, however if it was my scooter I would worry that the other cells in the battery pack might have also been damaged from overheating. From the photo showing the melted and burned through blue plastic heat shrink tube it looks like there was a lot of heat involved in the failure.
As far as replacement batteries go I would use name brand cells such as those made by Samsung or Sanyo. They have less problems and last longer than the generic no-name brand lithium ion batteries, and they usually do not cost that much more either.
Although it could have been caused by a manufacturing defect, I think that the battery pack failure was most likely caused by too much of a load applied to the battery pack. These type of small lithium ion batteries can not handle outputting too may Amps or else they will overheat. Lowering the gear ratio like you are planning to do will lower the power load on the motor which will in effect lower the Amp load on the battery pack and it will run cooler.
I hope not to have to replace the whole battery pack (looks like this would be expansive), so I will try replacing the dead cell first.
I bought an e-scooter recently with the following specifications:
Brushless permanent magnet DC motor
Rated speed: 2400 r/min
Rated Voltage: 18.5 V
Capacity: 10 Ah
Voltage: 18.5 V
Brake: Power brake, mechanic disc brake
Max speed: 15.5 mph
Max load: 176 lbs
Scooter weight: 18.04 lbs
Grade ability: 15 degree slope
The e-scooter seems to struggle to climb small hills (with 165 lbs load), it gets stuck, I would appreciate any suggestions to modify the e-scooter so it is able to climb hills.
Which is the approximated minimum motor power required for hill climbing? Any brushless DC motors recommended? Which components would be required in the modification?
Could you please give me a few options and quotation.