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  1. S

    48v lto design

    I don't understand why you'd consider LTO for an ebike battery. If you want a boring, safe chemistry that's more energy dense than LTO by a good margin, use LiFePO4. LTO is useful if you care about getting tens of thousands of cycles while, by any other chemistry's metrics, abusing the battery...
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    I bought a used Chevy Volt - and you probably should too!

    Those aren't generally available on the used market, are they? I haven't really seen, well, any of those used. In the realm of "200 miles and DC fast charging" starts to look useful for a long range car on the highway. If you're putting a ton of miles on, the delta in operating costs starts...
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    I bought a used Chevy Volt - and you probably should too!

    Short of either pulling trucks or the coal rolling morons (most diesel truck owners hate those idiots as well), a normal diesel is never running rich of stoichiometric - it's all lean side operation. You can get up close to stoich, but your EGTs head up in an awful big hurry and you run a very...
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    I bought a used Chevy Volt - and you probably should too!

    Either GM wasn't able to make money on it, or they couldn't sell it - one of the two. I suspect the second more than the first, because the experience at dealerships when I was looking for them was truly depressing. It's a car that makes a ton of sense for just about everyone who needs a...
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    I bought a used Chevy Volt - and you probably should too!

    Thanks for the info on the Prius option - I didn't mention it except in passing because it didn't really match our driving needs (20-30 mile round trips into town, infrequent highway trips). That's nice if you're doing a lot of longer driving (which I list as one of the reasons that you might...
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    I bought a used Chevy Volt - and you probably should too!

    The Bolt is Chevy's long range pure electric. The Volt is Chevy's plug in hybrid with a gas engine. Whoever thought that was cute should be stuck explaining it to everyone, because it hasn't done anyone any favors.
  7. S

    I bought a used Chevy Volt - and you probably should too!

    Donate me one and I'll mess with it! :p The attitude about the Volt from the salesmen was... interesting. It was literally, "There's no point in me learning about this car. The only people who are interested know way more about the Volt than I do, and nobody else wants it." Odd attitude...
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    I bought a used Chevy Volt - and you probably should too!

    Shamelessly copied from my blog: https://syonyk.blogspot.com/2019/07/i-bought-used-chevy-volt-and-you-should-too.html I give myself permission to use my work in this way. ;) For those who don't live in a place where a short range BEV is a valid option - consider a used Volt! It can do...
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    Lithium Batteries Shipping Rules Discussions

    In 2019, the shipping label requirements changed for batteries. I found a remarkably good interactive guide to the labeling requirements: https://hazmateam.com/uploads/2019LITHIUMBATTERYSHIPPINGGUIDEINTERACTIVEMARCH182019.pdf But if you've got old labels, they're not good for much anymore -...
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    Have you seen negative voltage on cells?

    It's not an urban legend. I've seen it multiple times on old, dead packs. I've see -2.69V on one cell group. https://syonyk.blogspot.com/2016/11/trek-transport-battery-teardown-with.html If one cell group is weak compared to the rest, it'll have lower capacity. Say, 900mAh vs 1500mAh or...
  11. S

    The end of BionX?

    Nethers Wholesale is definitely a good source. I'm another, though I'm trying to ramp down my time spent building batteries so I can focus on other projects. The 37V and 26V packs are rock solid. I know of a few BMS failures on them, but they're very, very rare. The Trek Ride+ packs (11S)...
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    Why not to try revive abused cells!

    Yup. I won't touch anything below about 2V, and that's only if I know exactly how it got there and how long it's been there. Below 2.5V with unknown history, nope. And LVC on most of my stuff is 3.0V.
  13. S

    BionX battery mounting rail?

    BionX is out of business in the US, and somewhat unknown status in the EU. You're not going to find a rail cheap at this point. Sell the pack to someone who is desperately looking for it, and buy something else decent. You'll come out ahead.
  14. S

    The end of BionX?

    BionX, from the perspective of the United States, is dead and gone. Period. You get what you get out of your batteries and the rest of the system, and when they die, if you can't get still working parts, you design something else, because BionX is closed source, proprietary, and almost...
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    The end of BionX?

    Watch out on the 11S Trek BMS boards. I've seen quite a few of those dead, which I can't say of the 10S boards. Put a LiMn at 4.10V and 4.20V in series, then cycle them a few times, and you'll see them work out the differences and come to an equal voltage over a number of cycles. They're not...
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    The end of BionX?

    The Konion thread has an awful lot of observations about how this particular chemistry self balances, so check over there for details. I can say that the BionX packs with the LiMn cells, after years of service, have cell groups within 0.01V of each other, so whatever they were doing, works...
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    The end of BionX?

    The spinel LiMn cells ("Konion") will balance properly without a balancer. That is not true of other, more modern lithium chemistries, and you can't get away with the same style pack design on newer cells safely.
  18. S

    The end of BionX?

    Hm? My first rebuild was the iZip Ultra. I've done plenty of LiMn BionX repair since then, but they have a solid BMS (with the exception of the 11S units - those seem to kill BMS boards). The 48V units are something totally different, and are unreliable as hell. The BMS blows up and then...
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    The end of BionX?

    In case there was any question that BionX was done... you don't part out the assembly line stuff when you plan to go back into business. They're toast. Sucks for everyone who bought a 48V system. Those will be so much scrap inside 5 years.
  20. S

    Best practices in voltage before stringing cells

    If you've ordered new cells from a vendor, they should all be at the same (+/- 0.01V) shipping voltage - usually sub-3.7V. I normally see around 3.60-3.64V on the stuff I order, depending on the particular variety of cells. If they're all over the place, they're probably not new, OEM cells...
  21. S

    Bionx 48V SL 350 XL battery charging issue

    Any idea why they're doing the 26V charger with boost circuit instead of just having a proper charger output? Is there some limit at 50V that they can't exceed for end user equipment? And the 48V BMS boards are just crap anyway. If they're not frying one thing, they're frying another.
  22. S

    The end of BionX?

    Welp. Gonna be an awful lot of pissed North American owners with dead systems here in the next few years.
  23. S

    The end of BionX?

    I'm not sure you need the +5V - I'm not sure where the CAN High line comes from. It wouldn't surprise me if it was from the battery pack, though... Regen not working is no surprise, the controller can't know the battery state and if it's safe to push more current in. But, yes, that looks...
  24. S

    The end of BionX?

    Empirically, an awful lot of people. Who has a spare $10k and is into ebikes? That's a harder question...
  25. S

    The end of BionX?

    Sadly, no. BionX took what should be a simple interface and overcomplicated it to the point of unreliability. The BMS board talks the console over either I2C (on the pre-2008-ish units) or Canbus, and communicates battery state of charge over that channel. The raw voltage is probably...
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