Thread: Hybrid vs petrol - surprising outcome

Originally Posted by No.3

You mean single cells out of a battery? It's a hard one, theres a heap of labour skinning the things just to get into the battery pack and then you've gotta get the thing out and onto a bench to find out what the go is. Provided you follow the elecy bitey dancy rules, it's not that bad workflow wise it's labour... The issue is when you aren't informed of the rules or treat the thing like a 12v automotive battery - volts thrill, amps kill as they say.

He started off replacing single cells only to find that the Uber driver returned two weeks later wanting a refund because the problem reappeared. Other cells were beginning to shit themselves. This happened quite often so he stopped doing it and only does full replacements.

Originally Posted by 300winmag

He started off replacing single cells only to find that the Uber driver returned two weeks later wanting a refund because the problem reappeared. Other cells were beginning to shit themselves. This happened quite often so he stopped doing it and only does full replacements.

Makes sense, replace one part and it transfers the weakness to the next weakest link. I looked at one battery in bits the other day, the guy doing it tested each cell and basically half failed most with the visual check (bulges or terminals corroded etc etc) so the entire pack was written off - some of the cells might be reused to keep something else going for a short time but when you get to that amount it's not worth the potential hassle factor.

Originally Posted by No.3

Makes sense, replace one part and it transfers the weakness to the next weakest link. I looked at one battery in bits the other day, the guy doing it tested each cell and basically half failed most with the visual check (bulges or terminals corroded etc etc) so the entire pack was written off - some of the cells might be reused to keep something else going for a short time but when you get to that amount it's not worth the potential hassle factor.

Same with re celling power tool batteries. Factory cells are measured and batched, ie A with A, B with B and so on. Re calling you just put random cells together. Like putting epsom salts in your lead/acid battery, works but it’s temporary

Originally Posted by Maca49

Same with re celling power tool batteries. Factory cells are measured and batched, ie A with A, B with B and so on. Re calling you just put random cells together. Like putting epsom salts in your lead/acid battery, works but it’s temporary

Me just put random cells together? Ha - I batch by colour...

It's a interesting one - the tests on them can go on for days and no cells test the same at the end of it. That's a true black art - the guys that do it for a living will look at a pair of results virtually identical and separate the cells into different batteries. When you ask why they just tap their noses!

My gear measures charge voltage and amperage against time, total capacity, and discharge current against a known load among other things. It's really very basic in the scheme of that game, but generally you can arrange things so the highest resistance cell is highest in the queue so to speak so the others are working off that to balance the load.