Recent content by AntonyC

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    Battery Fires

    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...
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    Free public battery charging scheme

    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...
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    Battery Fires

    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...
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    Free public battery charging scheme

    £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...
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    Free public battery charging scheme

    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?
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    Help! Replace/refurbish Giant Enerypak 400 battery

    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...
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    Battery Fires

    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.
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    Thoughts on this replacement battery for Swytch?

    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?
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    Free public battery charging scheme

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

    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...
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    Free public battery charging scheme

    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...
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    Free public battery charging scheme

    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.
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    YOSE or Whoosh or Boost, or Something Else, for Conversion But Legal?

    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...
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    YOSE or Whoosh or Boost, or Something Else, for Conversion But Legal?

    I've been impressed with the quality of the electrics on my Woosh bike.
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    Fox poo mudguard mishap! - Mudguard safety concerns...

    Without a mudguard gravel seldom jams under the fork crown. I think that's partly because it isn't being wedged by the slow taper of a mudguard, so try setting the rear edge to be the closest point to the tyre. Similarly, before my time a wire loop (or brush) was used to skim the tyre and...