Recent content by Syonyk

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...

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...

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...

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...

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...

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.

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...

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...

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 -...

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...

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)...

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.

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.

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...

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...