nimh cells

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Boron said:
BY CONTRAST - Lion WARNING HERE TO ALL I recently had a spontaneous Lion battery fire on a cordless tool bought new from a reputable name. It was only by sheer luck I didnt burn my house down. The tool was dormant not on charge in my desk drawer. See pix
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I hope you reached out to the manufacturer about it. There could be a production run with similar issues that may need a recall.
How old is this driver?
 
Boron said:
hi Igor @100kwh-hunter Your work is epic and contributes enormously to our community knowledge. Its also on a par with the legendary Pete from https://www.youtube.com/@HBPowerwall/videos in OZ. He spent 7 solid years along a similar path trying to recycle old free Lion cells from Laptops. You must surely know this work.
He had to spend a huge amount of time testing thousands of cells individually for SOH before he would commit them to a power wall.

It seems that NiMH cells just wont play nicely like this and stay within acceptable limits to use in a power wall. Once inside the structure its impossible to detect cells that are drifting out of limits (and must be replaced).

I think you concluded elsewhere that NiMH is just not suitable in strings for power walls at any price and the stored energy density, wiring complexity (thousand+ joints) and consequent weight are also a negative factors

Yet these cells can perform for years in small cordless power tools for example. They get used intermittently and recharged very crudely (remove battery pack from charger when warm is all the warning of charge complete you get)

I have a hedge trimmer still going strong after 6 years and a screwdriver after 10 years (its a NiCad)

BY CONTRAST - Lion WARNING HERE TO ALL I recently had a spontaneous Lion battery fire on a cordless tool bought new from a reputable name. It was only by sheer luck I didnt burn my house down. The tool was dormant not on charge in my desk drawer. See pix
Click to expand...
Bought new BNIB on Ebay 3 weeks ago, seller authorised Amtech dealer allegedly with good FB score, Item was brand new, charged once, used a couple of times for a few minutes light duty then put in a drawer not plugged in. Seller refunded immediately and said he would take this up with Amtech. As a simple customer what else can I do? count mike lucky stars

But then Escooters are known to burst into flames? Lion cells of poor quality can develop internal shorts
 
Boron said:
Bought new BNIB on Ebay 3 weeks ago, seller authorised Amtech dealer allegedly with good FB score, Item was brand new, charged once, used a couple of times for a few minutes light duty then put in a drawer not plugged in. Seller refunded immediately and said he would take this up with Amtech. As a simple customer what else can I do? count mike lucky stars

But then Escooters are known to burst into flames? Lion cells of poor quality can develop internal shorts
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Considering you've done your part, not much more you can do. Unless you decide to contact Amtech manufacturing directly. Which, tbh, might be worth a shot regardless of what the seller says. Might even be worth posting the results on Twitter and tagging them. That usually sets a fire under most companies to start making changes.
 
Korishan said:
Twitter and tagging them.
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hmm I dont have experience with soc media but a deep seated suspicion on their invasion of your privacy, mining your data and that you become an asset to be xploited. (bad time with a facebook trial once using a totally fake set of ID data - it still started spying on me and drawing string where ever I went webwise - even using a VP - very scary)
 
That's why I only use mine for very specific things, and complaining about products is one of them :p
 
Korishan said:
That's why I only use mine for very specific things, and complaining about products is one of them :p
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Thanx K, I will try and get a neighbour's school kid to help me. The little nerds are very smart about things like privacy and creating aliases to stop Big Corp stealing your data and spying on you (yes they claim its for improving the customer experience BS) What worries me (at my silver surfing seniority why should I care - but I feel its my duty to care because of the effect I can see with the self serving politicos and profit driven bean counters of such ruthless malevolence and the crushing effect it has on the future of young persons and their development - goddammn there goes my blood pressure again.
 
Boron said:
Thanx K, I will try and get a neighbour's school kid to help me. The little nerds are very smart about things like privacy and creating aliases to stop Big Corp stealing your data and spying on you (yes they claim its for improving the customer experience BS) What worries me (at my silver surfing seniority why should I care - but I feel its my duty to care because of the effect I can see with the self serving politicos and profit driven bean counters of such ruthless malevolence and the crushing effect it has on the future of young persons and their development - goddammn there goes my blood pressure again.
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Way off topic dude
 
I had a 18650 cell tested 100% on all my tests(and all of my testing is a fall out race!)...........vented after 2 months, oke it was warm in the shed 45C.
Li-ion is a very good chem/cell, but know the chem its limits!!!!!!!!
 
Boron said:
It seems that NiMH cells just wont play nicely like this and stay within acceptable limits to use in a power wall. Once inside the structure its impossible to detect cells that are drifting out of limits (and must be replaced).
Click to expand...
They have some own sets of rules
 
Boron said:
I think you concluded elsewhere that NiMH is just not suitable in strings for power walls at any price and the stored energy density, wiring complexity (thousand+ joints) and consequent weight are also a negative factors
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0.25 wire is fine, but those cells are NOT capable of giving or receiving more than 300mah.
And NiMh is THE cell for storing energy, but at max at 24V!!!!!!!!!!!!!!!
They will outlive you, if handled properly.
 
Boron said:
hi Igor @100kwh-hunter Your work is epic and contributes enormously to our community knowledge. Its also on a par with the legendary Pete from https://www.youtube.com/@HBPowerwall/videos in OZ. He spent 7 solid years along a similar path trying to recycle old free Lion cells from Laptops. You must surely know this work.
He had to spend a huge amount of time testing thousands of cells individually for SOH before he would commit them to a power wall.
Click to expand...
Yeah that ïdiot" got me into this 18650 and other junk...thanks to him I refined all my knowledge about li-ion on this forum.......
I was stuck on NiCad and NiMh.......
I cant thank him enough!!!! a Perth mint is coming his way after the system has payed off for him self....he will get one.
 
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