powabyke conversion

If you don't already have batteries and aren't fussy about 'system', there are these:

It says Samsung cells (which is good) - although in this teardown they use LG cells:

Generally with lithium ion there's not much capacity left once you hit the bottom end, so while they still have voltage it'll sag if you pull any current. So it's not really a problem to discharge until the BMS cuts out, although the cycle life will be improved if you don't do that.

Theo

I had seen these but they are rated at only 2.5Ah when used in 40V mode.

Also Makita tool battery holders seem readily available as spares.

What is the difference in use between li ion and lipoly?

Do the ones in the link have a batterry management built in to prevent dangerous discharge?

Interesting.

It sounds like a solution of sorts (a bit like selling The Big Issue here where it gives out_of_work people an income) or collecting up deposit paid drinks bottles when I was a kid. ;-)

Do you know the current legislation of electric scooters over there as I think you have had the bigger Segways over there for a long time now?

Over here they are running restricted trials of electric scooters to run along the same sort of lines as the electric assisted cycles, but they are still illegal to use here (public road or footpath).

However, when going out for a dog walk yesterday (with Mrs on the mobility scooter, testing it for me and resting her arthritic foot), we saw a couple of Police persons talking to someone outside a pub and on the way back (3 hrs later) we saw a bigger group of Police there again, talking to some folk ... and saw a couple of men coming along the footpath opposite. they crossed over and scooted up to the group of Police persons (and I think one went into the pub).

I was watching to see how the police reacted to the guys on electric scooters on the footpath but the didn't seem to at all, making me think they weren't bothered or that they might be undercover Police, using scooters themselves (but I'm not sure how that might work legally)(in a similar way to the cycle mounted Police checking on cycle based issues).

I know of at least two people who currently regularly commute (reasonable distances) on electric scooters and (round here anyway), I think the mix of shared use footpaths (the footpath divided by a white line with one part also allowing cycles, electrically assisted cycles and push scooters etc) means that most people are used to such and ITRW, everyone seems to get on?

I think electric scooters offer a solution not found in anything else in that it might be easier to keep dry in normal gear when standing (compared with cycling) and it's much easier to carry and stow (<the biggest problem in a country not typically known for actively supporting personal transport solutions) at work (might go in a locker etc).

Cheers, T i m

As I said it's way OTT for Yuasas.

NT

Lithium polymer relates to the electrolyte, lithium ion to the general chemistry (where exactly composition can vary). Lipos are lithium ion, but not all lithium ion are lipo. Most Lipos are in plastic cases rather than metal cylinders. That means they're more vulnerable to mechanical damage and thermal runaway.

No, and they need careful external monitoring while charging, otherwise they might burn your house down.

Theo