Recent content by AntonyC

I get a rough figure of 1 degree per watt for a downtube battery case in still air, which ties in with our estimates for 10A and 20A falling either side of 'probably OK' in heating terms. Just want to add that it's NOT OK to simply replace a 4A fast charger with a 10A one because heating isn't...

I think it was more likely the BMS. In ball-park figures, typical pack resistance = 200mOhm (approx and varies widely), 10A -> 20W of heat into 3kg of cells x 0.8J/gK. That's like heating a kettle (1.5 l x 4.2J/gK) with 50W, lots of time to cool as it heats. As it nears full charge the...

Also most ebike batteries use P-groups meaning there's no real control over individual cell current - in some ways the cells appear to support one another and all's well until it isn't. Battery makers leave substantial headroom too for temperature effects, ageing and BMS shortcomings in...

Certainly ebike fires are hyped but the situation is unacceptable. Quality issues are always possible as @saneagle says, and not all damage occurs through moronic abuse. A few batteries do catch fire when charged for too long or with the wrong charger and that's failure by design: both are...

£50 delivered is one advantage, you don't want a battery to cost that. My own charger weighs 1kg with the leads and is the size of an A5 book, it takes 20 minutes to add 15 miles but that's not a lot to carry. It's not for everyone, you need the right battery and have to make sure charging...

I know of two others doing exactly this. How has EV charging matured, is it a hassle needing multiple accounts and annual subs? Do supermarket filling stations generally have 3 pin outlets too?

If you ordered a replacement battery for your particular bike a retailer would be responsible for it working, and I'd have thought a consumer order through a dealer would count as retailing. If you ordered the specific battery and a minor variation catches you out, batteries sometimes aren't...

Two fires in nearly two years, one with a cause the govt had already acted on. A Nottingham councillor (Labour) will write to the fire minister (Nottingham North, Labour). I smell the dead hand of Electrical Safety First on the faltering UK e-cycle industry, ah yes, line 15.

The BMS limits look optimistic for unbranded cells so there's not much protection there. Does it fit the Swytch case and would it survive a corner impact if not?

You could well be right. UK ebike sales are 8% of Germany's per capita (2023). The future's what we make it.

You're right of course, in the context of today. Paradigm shift: it's 2030 and everywhere riders park up, plug in the bike and go about their day. The EU faced pushback about cell level recycling so, mindful of their success with USB-C, they standardised charging interfaces. 300Wh - 2 hours...

600Wh (50-ish miles) in quality cells doesn't come cheap nor fit easily inside a downtube, so you can see the need could arise. I'm intrigued how a 'morphix' scheme might get off the ground, attract startup capital, retain a co-ordinator, initiate roll-out, reach the public etc. - is that even...

There's no call for public charging because people aren't aware it could work, but those practical objections are technology based so they could be solved. Free, public, make it fast and safe too and what's not to like? What we need now is a cult sci-fi film in which it just happens.

Standard sizes are 73mm for BB and 135mm for rear DOs. Batteries vary, 92mm is a common height including the mounting plate but not allowing for removal nor possible details under the plate like projecting inserts and rubber stabilising gaskets. If you allow 4mm both bikes look quite snug even...

I've been impressed with the quality of the electrics on my Woosh bike.