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The 20 in the Dawes Arc 20 is the wheel size. I don't know the difference between the I and the II. The Osprey looks as if it has very standard parts in case of any issues. The Dawes is fairly standard, but a bit questionable on how special the frame integrated battery is. The battery is also...

The Batribikes and others at County E bikes look sensible; a bit above your suggested budget but several on sale below £1000. One thing to watch out for is how tied in you are with the Promovec system if anything goes wrong, or when you need a new battery. There's a lot to be said for hub...

The bike shop in Shawford are very helpful and do some rental, if that's not too far south for you. https://www.thecyclecompany.co.uk/ I think all their bikes will be above your budget to buy. If you already have a bike it might be worth considering a conversion. Unless you hit very lucky any...

Sorry, I didn't notice that. The rack ones (both 400 and 500) were out of stock at Merlin when I first looked. I'd signed up for a reminder email and forgotten all about it. I was on the verge of buying a couple of months later from Winstanleys. Luckily they went out of stock from there, and...

£449. https://www.merlincycles.com/bosch-powerpack-500wh-performance-frame-battery-107834.html I bought a 500wh rack battery from them a few weeks ago. Quick delivery, very good price.

You shouldn't charge below 0C. Could be an issue charging away from the house in the winter. If you don't use it in winter you'll probably still need a check charge (to about 60-70%) every couple of months.

So both of those give exactly same (and nicely rounded) value of 200Wh/kg, 5kg/kWh

When you say getting a 5v -0v when I pass a magnet over it; did you do that test with the wheel magnet itself, or just passing some other magnet over the sensor? The distance between the wheel magnet and the sensor as it passes is also important; too far is definitely a problem, and even too...

Another vote for Woosh. We have an XF07 front hub from them on our tandem. A bit underpowered for the tandem. They warned us when we bought but there was no alternative legal option at the time, and it gives almost all the help we need. They arranged to make all the cables appropriate length...

Maybe in OP's area 'refuse collection point' means they refuse to take collection.

In the (unlikely) event of close scrutiny, eg after an accident, a 250w sticker over a motor with a 350w engraving will certainly count against you in the decision whether to prosecute, and in (extremely unlikely) any resulting trial.

What matters is the amps (current) a battery can deliver. If they are the same cells and just twice as many (in parallel), then the 20ah battery will be able to deliver twice the current of a 10ah battery. You can get high current 10ah batteries (better cells), but unlikely to be good for a...

It's when you are tired and nearly out of your own charge and hit a hill near the end of a ride that you need the motor help most. Batteries are very empathetic; it's exactly at that point that the battery sag hits in and cuts out the motor.

No need for a motor, just attach pedals to the front wheel like a starter kiddy trike and the cow can do the work.

Yes, my combined concern that they were coming more difficult to find at all, plus the possibility of sudden decline, and the good Merlin price, made my final decision easy. I thought for some reason you were still on your original battery, which seemed miraculous considering how long you've...

Not sure if any Bosch battery can be counted as a bargain, but very reasonable £349 for a 500wh rack battery: https://www.merlincycles.com/bosch-powerpack-500wh-rack-battery-303236.html Delivered next day (they'd said 2-3 days).

Just got an email from Merlin to say the Bosch 500wh rack battery is back in stock at £349. I'd forgotten I'd asked to be informed. That seems a very reasonable price, and they do well on trustpilot, so I've ordered it...

Do you have a price to recell a working but tired Powerpack Rack 400 (2016 approx)?

Not sure about the UK LEGAL. 37km/h with the throttle.

Probably not relevant as the original post was over a year ago, but £570 https://winstanleysbikes.co.uk/bosch-powerpack-500-rack-type-battery-pack