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Battery revamp is worth doing

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hpcboy Page Icon Posted 2020-10-16 5:34 PM
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I am no battery specialist, but here is a very detailed report of testing the capacity of 3xxx mAh cells:

https://www.wii.tw/~fogerdis/viewthread.php?tid=58810
(It's in Chinese from a forum in Taiwan. Google Translate should work well.)

Basically the guy talks about the new generation of NCR18650 cells (Sanyo? Panasonic?). The cells in those photos look identical to the ones I got.

In short, the 3,400 Sanyo cells (any many other brands) truly exist on the market now.


Edited by hpcboy 2020-10-16 5:38 PM
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hpcboy Page Icon Posted 2020-10-17 2:42 AM
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Here's a 5-year old review of Nitecore 18650 3,400mAh cells:

https://www.youtube.com/watch?v=TeEyRP80C-E

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Jake Page Icon Posted 2020-10-17 3:33 AM
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Your work on this is great. Very clear, very helpful. Thank you.

Jake
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hpcboy Page Icon Posted 2020-10-22 1:15 AM
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Just saw another old comparison video of four different 18650 cells. Pretty informative and clear for newbies.

https://www.youtube.com/watch?v=Wnf0RnXhgjY

I'm going to recell another Jornada battery pack. Gotta give LG a try next time.


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CE Geek Page Icon Posted 2020-10-22 2:41 AM
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The drive to improve the 18650 has been accelerated by the increasing market for electric vehicles like mine, whose chassis-mounted battery banks are, from what I've read, made up of 18650 cells.
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hpcboy Page Icon Posted 2020-10-22 4:08 AM
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Wow, there must be a TON of 18650 cells inside...

A short update of my previous Jornada recelling quest:
The second full charge also lasted around 16 hours. This time I was launching PocketDOS all the time (running GrandView 2.0), alongside other regular tasks (PocketWord, syncing without A/C, etc.), and the processor intensive Slay . Still no networking yet (waiting for a feasible wifi card with WPA support so that it can use the shared 4G network from my Android phone).

For sure, my so-called tests are far from accurate, let alone professional, but having 16+ hours of runtime seems juicy enough given the low cost of the surgery. Yet the temptation to buy a decent discharger on my next gadget shopping trip seems to be growing day by day.
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C:Amie Page Icon Posted 2020-10-22 9:14 AM
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Morden at MPH makes his own 18650 battery banks for his solar system. He is using second hand cells to do it too









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stingraze Page Icon Posted 2020-10-22 11:10 AM
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looks extremely dangerous...
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C:Amie Page Icon Posted 2020-10-22 1:57 PM
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He isn't dead yet
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stingraze Page Icon Posted 2020-10-22 2:02 PM
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lol.
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Jake Page Icon Posted 2020-10-22 3:23 PM
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Or maybe his hands are all that's left of him.

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hpcboy Page Icon Posted 2020-10-22 4:20 PM
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I haven't watched the clips yet, but I just wonder how he managed to ensure that all the cells' different calibres (capacity, discharge rates, resistance, etc.) won't affect the overall safety, not to mention stable performance, for such huge arrays of cell connections. Added to the danger is the cells are already used items. I don't want to envisage what comes next when a couple of shorts or leaks begin to happen ...

I seriously doubt doing this in the neighbourhood is legally allowed in many places. Looks not so different from producing homemade explosives...
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C:Amie Page Icon Posted 2020-10-23 7:45 PM
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More fun with 18650's today

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stingraze Page Icon Posted 2020-10-24 10:34 AM
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hpcboy - 2020-10-23 1:20 AM



I haven't watched the clips yet, but I just wonder how he managed to ensure that all the cells' different calibres (capacity, discharge rates, resistance, etc.) won't affect the overall safety, not to mention stable performance, for such huge arrays of cell connections. Added to the danger is the cells are already used items. I don't want to envisage what comes next when a couple of shorts or leaks begin to happen ...

I seriously doubt doing this in the neighbourhood is legally allowed in many places. Looks not so different from producing homemade explosives...

Yeah, I watched the clip a bit, and how I was like ???
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C:Amie Page Icon Posted 2020-10-24 1:17 PM
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He does go through and test charge rates, max charge and discharge capacities for cells and some degree of balancing. He also does some fire safety precautions in the latest video.
I seem to recall him blowing out at least one somewhere along the line too.

It's a home-brew Tesla battery when all is said and done. If it's safe enough to park in your garage at night, provided he knows what he is doing, one would assume it is no more or less unstable.
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