So I have the remains of a Swytch Kit, basically just the hub and the battery. I replaced the controller with a KT controller and all the wiring to make it work. Recently the battery isn't quite lasting long enough for my commute. I've had it for quite a few years so it's had a lot of use.

 

What would be a good replacement for the swytch battery, preferably one that will fit in the same case?

Thanks

Maybe provide a picture or a link to the Swytch 'case' so everyone is clear on which one you have ?

Good shout

I have one of them, which I stopped using.

 

The battery inside is nothing I ever saw as 'standard' although you can probably have one custom built to fit, maybe £250+ ish ........

Could you recommend anything else if I did ditch the case. I would probably need to be able to mount it on the handlebars as this is on a bmx so I have limited options to where it goes.

Look on ebay for 36v softpack battery, one may be able to find one that fits .

You will of course make sure you measure the size correctly .

 

You don't give us much at all to go on , no dimensions or even a pic of the battery or inside the case/bag.

Edited May 10, 20241 yr by Nealh

Chuck that stupid Swytch bag and get any 36v battery you want. Maybe show a picture of the bike if you want advice on which options there are.

I would like to see some pictures too. I don't quite understand what is the point of installing electric kit on BMX bike.

Edited May 11, 20241 yr by Az.

Thanks for the advice so far and apologies for the lack of photos. I will try and take some today.

 

It's not quite a standard Bmx, I have raised the seat post and the handlebars to make it a bit more comfortable. The point of installing the kit is to make my commute a bit easier, it's quite a hilly ride. I am not doing tricks on it. It's really fun too, I love it everytime I go out on it.

Thanks for the advice so far and apologies for the lack of photos. I will try and take some today.

 

It's not quite a standard Bmx, I have raised the seat post and the handlebars to make it a bit more comfortable. The point of installing the kit is to make my commute a bit easier, it's quite a hilly ride. I am not doing tricks on it. It's really fun too, I love it everytime I go out on it.

 

That is very surprising to hear about BMX used as commuter. Simply because they are not designed for that purpose. I am looking forward to see pictures of your bike.

Thanks for the advice so far and apologies for the lack of photos. I will try and take some today.

 

It's not quite a standard Bmx, I have raised the seat post and the handlebars to make it a bit more comfortable. The point of installing the kit is to make my commute a bit easier, it's quite a hilly ride. I am not doing tricks on it. It's really fun too, I love it everytime I go out on it.

I've got something like that (a Mk 1 Swytch) which I modified to reduce the bag profile and relocated a battery to a rear pannier (a Yose 36V). I like it - it is a different feel from the heavier Decathlon 500s I also have. I can also use it for shorter journeys with Bosch 36V batteries. See a previous posts ( here is an example but there are pictures somewhere). Peter

Edited May 11, 20241 yr by peterjd

Here are some pictures of my bike.

I must say it is one of most peculiar ideas I have seen.

 

Why not ordinary bike?

So I have the remains of a Swytch Kit, basically just the hub and the battery. I replaced the controller with a KT controller and all the wiring to make it work. Recently the battery isn't quite lasting long enough for my commute.

 

Can you stop fast enough when you need to? If not, is there any way to install a front brake?

 

Is your commute fairly flat? You've got the wheeled advantage for climbing hills, but with limited ease for your battery and you, because of course your BMX is a fixie. I imagine steep hill climbs could be difficult.

Here are some pictures of my bike.

[ATTACH type=full" alt="57668]57668[/ATTACH][ATTACH type=full" alt="57669]57669[/ATTACH][ATTACH type=full" alt="57670]57670[/ATTACH][ATTACH type=full" alt="57671]57671[/ATTACH]

The bag is too high to hold a heavy weight. You should get a downtube battery, put some rivnuts in the crossbar and mount it there, or make a rack for it and fit a battery there. Either of those two methods will make your bike handle a lot better.

AI

So I bought a new battery from Aliexpress and a suitable bag to mount it on the cross tube. I have it hooked up and I only get power assistance from the motor for a second or two. The battery I bought was a 10S3P 36v 120Ah. Are there settings on the controller could cause this?

Are there settings on the controller could cause this?

I can't think of any unless it somehow set itself to 48v.

When you connect the battery, does it show full on the bike's LED/LCD display, and if do, does it go down when you lose power? Does the display switch off when you lose power?

I can't think of any unless it somehow set itself to 48v.

When you connect the battery, does it show full on the bike's LED/LCD display, and if do, does it go down when you lose power? Does the display switch off when you lose power?

I will have a proper test this evening but i think it was not showing full charge and I think it was blinking but the display was not turning off.

120AH ?? that's an order of magnitude higher than expected? a typo or dodgy claim?

a photo of the battery label and or link to the ad may illuminate?

120AH ?? that's an order of magnitude higher than expected? a typo or dodgy claim?

a photo of the battery label and or link to the ad may illuminate?

https://www.aliexpress.com/item/1005007334575315.html?spm=a2g0o.productlist.main.15.6416LpoWLpoWyt&algo_pvid=3efe2ca9-0951-43d4-9471-bed255c0a23d&algo_exp_id=3efe2ca9-0951-43d4-9471-bed255c0a23d-7&pdp_npi=4%40dis%21GBP%2168.31%2132.10%21%21%21621.60%21292.15%21%4021039f3e17207113995174636e4559%2112000040310698714%21sea%21UK%210%21AB&curPageLogUid=7pcRe1sYpxKi&utparam-url=scene%3Asearch%7Cquery_from%3A

https://www.aliexpress.com/item/1005007334575315.html?spm=a2g0o.productlist.main.15.6416LpoWLpoWyt&algo_pvid=3efe2ca9-0951-43d4-9471-bed255c0a23d&algo_exp_id=3efe2ca9-0951-43d4-9471-bed255c0a23d-7&pdp_npi=4%40dis%21GBP%2168.31%2132.10%21%21%21621.60%21292.15%21%4021039f3e17207113995174636e4559%2112000040310698714%21sea%21UK%210%21AB&curPageLogUid=7pcRe1sYpxKi&utparam-url=scene%3Asearch%7Cquery_from%3A

Er. yeah, not an ad i would pursue, the capacity claims are BS, and no mention of the discharge current limit that i could see on the page at all. a less than 1.5kg battery with 120AH capacity is way too good to be true, 13-15AH perhaps if built with real quality branded cells, and probably heavier??.. I am no battery expert and hope i am proven wrong here but my BS detector is screaming loudly

Did delivery time out the complaints window ??

https://www.aliexpress.com/item/1005007334575315.html?spm=a2g0o.productlist.main.15.6416LpoWLpoWyt&algo_pvid=3efe2ca9-0951-43d4-9471-bed255c0a23d&algo_exp_id=3efe2ca9-0951-43d4-9471-bed255c0a23d-7&pdp_npi=4%40dis%21GBP%2168.31%2132.10%21%21%21621.60%21292.15%21%4021039f3e17207113995174636e4559%2112000040310698714%21sea%21UK%210%21AB&curPageLogUid=7pcRe1sYpxKi&utparam-url=scene%3Asearch%7Cquery_from%3A

You can't get a decent battery for £32. It'll have recycled cells in it that are probably worn out.

Right so my issues are probably due to a rubbish battery. What should I look for to find something decent and how much should I expect to be paying? A link would be greatly appreciated.

Right so my issues are probably due to a rubbish battery. What should I look for to find something decent and how much should I expect to be paying? A link would be greatly appreciated.

A decent 36v battery is around £180 upwards for a medium sized one. You can get some good ones for a bit less from Aliexpress, Ebay and Amazon, but you must use a bit of logic and you should always be skeptical. What do the reviews say? What's on Google about them? How many reviews are there and what do they say and do they look genuine?

 

There are a couple of good suppliers we use if they have one that suits you.

https://www.yosepower.co.uk/collections/36v-battery

https://greenlance.co.uk/collections/36v-electric-bike-batteries