Hi. I have a couple of bikes and and one needs a new battery.

This seems an ideal time to transfer the battery off my main bike, that will get my "needs a new battery" spare bike working and I can then buy a new & improved battery for my main bike.

Just checking if anyone can see problems if I upgrade the battery on my KT / Yose 350w kit from 36v to 48v ? The controller is dual voltage 36/48.

Battery fitted now is the original Yose 36v12Ah that came with the kit about 3 years ago, regularly use but some periods of not being used. Range is well matched to my needs, I normally make a 40km shopping trip on a hilly route and the battery comes back with very little left if I. If I move up to 48v am I right in thinking a 48v12Ah battery will have a lot more range and hopefully more power on the hills?

This looks like a decent option from PSW, 48v 15Ah with Samsung cells https://www.pswpower.com/products/eu-no-tax-electric-ebike-battery-hailong-g70-samsung-lg-18650-cells-pack-48v-13ah-145ah-175ah-lithium-battery-fit-1000w-motor-108

Background about the Yose kit and the bike it's on Link to the build thread https://www.pedelecs.co.uk/forum/threads/yose-350-rear-hub-kit-transplanted-onto-scott.40186/

😀

4 minutes ago, Scorpio said:

Hi. I have a couple of bikes and and one needs a new battery.

This seems an ideal time to transfer the battery off my main bike, that will get my "needs a new battery" spare bike working and I can then buy a new & improved battery for my main bike.

Just checking if anyone can see problems if I upgrade the battery on my KT / Yose 350w kit from 36v to 48v ? The controller is dual voltage 36/48.

Battery fitted now is the original Yose 36v12Ah that came with the kit about 3 years ago, regularly use but some periods of not being used. Range is well matched to my needs, I normally make a 40km shopping trip on a hilly route and the battery comes back with very little left if I. If I move up to 48v am I right in thinking a 48v12Ah battery will have a lot more range and hopefully more power on the hills?

This looks like a decent option from PSW, 48v 15Ah with Samsung cells https://www.pswpower.com/products/eu-no-tax-electric-ebike-battery-hailong-g70-samsung-lg-18650-cells-pack-48v-13ah-145ah-175ah-lithium-battery-fit-1000w-motor-108

Background about the Yose kit and the bike it's on Link to the build thread https://www.pedelecs.co.uk/forum/threads/yose-350-rear-hub-kit-transplanted-onto-scott.40186/

😀

The range is determined by how many watt-hours in the battery and how much power you use. Your controller will allow the same number of amps, so you'll be getting more power. Also efficiency might be a bit lower. It's difficult to predict whether that will be the case because the faster climbing speed due to more power can make the motor more efficient.

Whether the 48v upgrade is good or not depends on your weight, fitness and hills. I'd say that if you're over 90kg, I think you should try it. if you're 75kg or less, I don't think there's any advantage unless you want to ride illegally with power above 15.5 mph, in which case 48v would give a huge speed boost.

If you had the 250w motor, a 48v upgrade would work much better than with the 350w one because the 350w one has a faster winding, and at 48v it becomes a bit too fast. Nevertheless, assuming that the extra power would be desirable for you, I think that the 48v upgrade would be good. I'm 95kg and have lots of hills. My motor is very fast. It still works well at 48v and set to legal speed - better than 36v. I'd prefer it with a slower motor, but I'm too lazy to change. Ideal is a 201 rpm 36v motor or 260 rpm 48v one.