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It looks like these Ego batteries are overbuilt and thus potentially extremely difficult to “service”. I have been considering trying to look for “dead” Ego batteries and dropping my own 18650s into them to revive them. But it seems like that will be really difficult and completely not...

For shoving Li-ion into a UPS enclosure, yeah it definitely seems like with 7s on a 24V system (rather than trying to do 4s on a 12V, where you lose a lot of capacity, and where 3S would be getting overcharged) is the sweet spot, and it would totally work. Unfortunately I don't believe my...

There are some issues with the use of 18650 Li-ion in systems that expect SLA cells. I think This link does a pretty good job of explaining why. The situation I have is I'd like to have a UPS to use with computers, and I have a ton of 18650 cells I've got lying around, but there are no...

Curious what your results were. Sorry for the thread necro but I'm strangely attracted to the concept of using simple mechanisms to measure battery or pack capacity. Now I really do like the concept of incandescent bulbs as a load. But, a microcontroller would be needed in order to do any kind...

Awesome, I did not realize that temperature sensors that spit out a voltage (they are calibrated as well!) are as cheap as 10 to 20 cents, seems like that makes them only around 5 times more expensive compared to NTC thermistors, but so much easier to integrate. That will do very nicely with a...

Thanks for that link!!!

Yeah, I know. I just sorta figure it may be another capability that could be used to discriminate cells from one another, produce a better signal for a temperature sensor to pick up, etc. It's clear that I should definitely simply buy a few more Opuses, for all the time i could save for myself...

Thanks for this thread @nz_lifer it's been very informative to me. I'm a coder but historically haven't been able to stop myself from getting seduced by power electronics. As I currently have a ton of 18650 packs on hand to disassemble and make something of, it was only a matter of time until I...

Hey there, curious what you mean by zb's and tc's? They must be the display boards and resistors or something, since I see 30x of those. Nice DIY setup!!

That's a really nicely engineered holder, I see that you test lots of different cells. I'm very curious what's the equipment that you use with the holder to do your testing?

Cool, this is interesting. What granularity do you group them into (how many different colors do you use)? I'm still on the lookout for decent setups for evaluating cell capacity. I have already taken apart my OPUS BT-C3100 since its 20mm fan was driving me absolutely nuts with its vibration, I...

Haha! Yeah I was surprised to see great deals readily available on battery hookup, looks like we can score cells for well under a dollar a pop in this kind of market, all it requires is rolling up your sleeves a bit. Yeah the modem battery packs look really easy to deal with. These packs I've...

In related news, I'm finding out that these packs that i'm disassembling are a real pain and take multiple minutes to take apart each pack. Sadly the heatshrink is the only thing separating the cells from each other (mega problem), and often these heatshrinks are so tightly stuck to each other...

Thanks. I have ordered 2 (and will probably get a third) Chinese battery discharger devices that use a 4 wire method. it should prove very useful for accurate cutoff voltage shutoff. I don't think I will have any need for accurate IR measurement. It's my understanding that those fancy $90+...

Thank you so much for the reply Keith. I tried to order a kWeld yesterday, but was dissuaded by the 45 euro shipping cost that got tacked on. I understand that if I want a kWeld delivered to me domestically in the US, you'd be the guy to contact! I get that there are certain design and market...

I have plenty of bulky and powerful cpu cooler heatsinks I can use for this. The DL24P-plus that you linked seems to be the real deal. I tried to look for in-depth reviews, but all I was able to find is this Russian one (I put it in a google translate frame)...

Thanks so much! Good catch. 4 wire seems a necessity for this task! I was able to find the English page after some digging, hate that aliexpress likes to use cookies to lock me on the German site after having seen your link. https://m.aliexpress.com/item/1005001565062996.html Hope I can cancel...

Can you comment on this unit? It seems cheaper and more capable (purports to handle double the current, more than double the voltage)...

I'm looking at my options for a spot welder, and I'm looking to get a kWeld because it seems really nice that it can deliver power metered welds. I also like it because the design is very appealing and it seems like such a well engineered piece of kit. I hope that maybe I might be able to...

Feels like a long shot, but... Do you still have this?