eMark said:
Cephalotus said:
It seems that 9 out of 10 packs fail after just some months of use, because single cells of 30Qs do develop heavy self discharging
Can we trust German Pedelecforum single cell vaper/pedalers? That's what happens when using 9 out of 10 30Q packs for unhealthy single cell 30Q use :wink: Maybe those ePedelers were under the impresson from Banggood that the 30Q had a 20A rating or maybe some of the 30Q cells were fakes (via LiitoKala Ali) ... http://budgetlightforum.com/node/60547
I'm just providing Information. Most of the cells have been bought from Nkon and most cell packs have been made by people that have built cell packs with other cells that behave just fine.
We are also not talking about one person or two, but a significant amount of numbers.
Some people have been very happy with the 30Q at least for some weeks until their packs got faulty, too and it does not affect all cells, maybe "just" 5-10 cells out of 100 (this is a wild guess), but sadly if you build packs with 50 cells and more your chances are very high that you will have faulty cells. Faulty means in that case the development of very high self discharge rates, something you will not be able to notice on a cycle test of single cells like the one discussed here.
Those cells fail one after the other, so repairing the packs doesn't help.
So this is the story about 30Q battery packs in the German forum.
If the 30Q is your prefered cell you don't need to defend it against me. If you want to use them just go ahead, I'm perfectly fine with that. I don't have a hidden agenda to promete any cells, we all are trying to learn.
---
Some people are desperate to identify "winners" and some people develop blind spots after identifieing their chosen winner.
I do read as many aging tests as I can find on 18650 cells and I do like the tests here. They can contribute to the bigger picture.
I don't try to fine "the best" cell, because this is very difficult. It takes 4-6 years after introduction until the aging charactzeristic of a cell gets clearer, so for the newest and maybe best cells you don't have sufficient data.
For me chosing a "good enough" cell is good enough
And good enough always depends on your personal specifica. Running BionX Systems year around for my Needs a cell must survive short cahrging Bursts at high current even in cold state because of regen. This is a very special feature which is almost never tested and which could be able to kill some cells very quickly.
Your cells may need to survice very different challanges.