Beginners Guide to Processing 18650 Cells | Cell Database


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Cell reviving question
#11
@daromer Thank you for the latest video.. I will order an appropriate resistor to set up a bump-charge holder Smile
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#12
I would say that is a very simple way to bump up a cell but still you keep it a bit better than just paralelling the cells to each other causing a big current rush in worst case Smile





Adding the video just in case
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#13
(09-12-2017, 07:23 AM)owitte Wrote: The TP4056 is also capable of gently charging up low voltage cells, it even takes cells with less than 1V, charges them slowly up to around 3V before pumping higher currents into them.

Now I have seen this in the spec sheet :
https://dlnmh9ip6v2uc.cloudfront.net/dat...TP4056.pdf
Quote:2.9V Trickle Charge Threshold (TP4056)
·
Soft-Start Limits Inrush Current

but when I connect a 0.5v battery to the tp4056 I see the voltage rise rapidly with a multi-meter connected to the terminals.

1. Does anyone know what trickle charge is?
Specifically, is there a constant amount in milliamps for the tp 4056?

In my experience using a multimeter on the terminals, it takes something like:
15-20 seconds from 0.5v to 1.9v
45-60 seconds from 2.0 to ~2.8v, which seems fast.
0.02v/second from about 2.9v to 3.4v depending on the battery.
3.4-3.7v which takes around 1min.
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#14
It should go rather fast from 0.5V to 1.9V. though 15 seconds seem very fast. Hook it up and use your multimeter to meassure the current on that mode.
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#15
For my "dead" cells (<1,0V) I put them into a holder attatched to a lab powersupply (set to 3A/4V) for about a second or two, if a cell immediately rises up to ~3V(on the display of the powersupply) they tend to be good, if a cell rises up to 4V and the current drops or it doesn't draw any current, I throw it away. Some of the cells treated this way rise to ~2,6Vand then short out, this is why it's not recommended to start with high current, but from experience i can tell you, that these cells are most of the time bad anyways (self discharge or riddiculously high IR), hence I don't care if I kill them, about 5-10% of my <1V cells have this problem.
If you want to save as many cells as possible, by all means avoid high charge currents, if you want a quick and mostly reliable way to sort out bad ones quickly my testing method has proven itself Smile

EDIT: All cells above i sort in 1V increments (ie. 1-2V 2-3V and 3-4,2V), then i put 16 of the same class into a charger and let them balance for 10-20mins before I switch on the charger.
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