Lightweight Swytch Max alternative with bottle battery

[logicped]

The Swytch Max is 3.1Kg with the front wheel (1.5Kg), battery (1.1kg) and mount. Only 18 mile range, but perfect for me. I like this, but with delivery it's £574 and only available in 4-5 months.

I want something similar weight/range wise but with a bottle battery instead. I can't seem to find anything that's this kind of weight. Other things I have seen are 6kg upwards.

I like the idea of the bike not looking like an ebike when the bottle battery is removed, so can lockup safely. I don't mind a small controller.

Any advice appreciated.

 

[Woosh]

I want something similar weight/range wise but with a bottle battery instead. I can't seem to find anything that's this kind of weight. Other things I have seen are 6kg upwards.

If your priority is lightweight, then consider a bag battery and keep the controller inside it.
For your 18 miles, you would need 36V 10AH to avoid range anxiety. A typical lightweight kit is thus something like Aikema 85SX with 36V 10AH (2s10p in 21700 5000mAH cells), 15A controller, the lot adds about 3.5kgs to 4kgs to your donor bike and gives you about 30 miles.

 

[logicped]

Perfect, thanks for this info. The 18 miles was actually accounting for range anxiety so hopefully get a slightly smaller/lighter/cheaper battery too. Essentially I want to do a 20-30 mile round trip every week, and use the battery on hills so perhaps will only use about 3-4 miles of the battery power.

If your priority is lightweight, then consider a bag battery and keep the controller inside it.
For your 18 miles, you would need 36V 10AH to avoid range anxiety. A typical lightweight kit is thus something like Aikema 85SX with 36V 10AH (2s10p in 21700 5000mAH cells), 15A controller, the lot adds about 3.5kgs to 4kgs to your donor bike and gives you about 30 miles.

 

[Woosh]

you can't cut down to much less than 36V 10AH because the battery has to be strong enough to provide maximum power you need for hills. A 36V 10AH = 360WH can give you about 360W * 1.5 max, about 500W without overheating. If you half that, like using two Bosch 36V 2AH tool batteries, you'll knacker the battery in no time.

 

[logicped]

Ah, that makes sense. Thanks for that!

you can't cut down to much less than 36V 10AH because the battery has to be strong enough to provide maximum power you need for hills. A 36V 10AH = 360WH can give you about 360W * 1.5 max, about 500W without overheating. If you half that, like using two Bosch 36V 2AH tool batteries, you'll knacker the battery in no time.

 

[Bikes4two]

I use a 36v 10Ah bottle battery on my 250w TSDZ2 - I ride mostly on assist level one at around 10mph average and my terrain is not overly hilly and get around 50 miles per charge.

The battery from PSW Power is under £140 - on the bike it looks like I'm carry a lalrge flask rather than one of those bulky Hailong jobs.