Cells measured after over 5 years of storage

I am attaching a table with the results of recent capacity testing of a few hundred recycled cells that have been stored at full capacity for 5+ years and recharged about 1 time per year.





Notes:

The colors represent the cell color. Similar for the cap color (the 'O').
The 3-letter abbreviation represents the manufacturer.
The 'ST' marking represents the model of the cell (series tag).
Everythingelse should be clear.

The Panasonic 3100 and the 2 Samsungs 22F at the start of the table were brand new (and also most fake-ultrafires), the rest recovered from notebook / power toolbatteries.

Kewls! That's a very time consuming test ya got there

What were the charge/recharge currents? Is that the C-1A column in mA?

Wow, nice work, really nice.. gives a good indication of calendar aging effect.
Just for clarity the first column is the "quoted" sold as capacity and the C-1A is the last measured capacity... ?

Did you measure the capacity each year ? If you have the readings each year that would be absolutely awesome to see the profile over each year.

Really intreseting to see a few cells falling off the cliff edge losing >60% capacity.
This is the type of data that people need on the forum.

Nice work, keep it going !

Nice work and good info.
Would be nice to know what the "true"IR is of these cells right now.
Also of course what it was at time of storage and every year after that.
That would be the cats a** to see the IR changeor not change over time.

I also wonder with the cells being put into storage at full charge if the Voltage pressure caused them to degrade to what they are now.
I wonder how these cells would have performed in a pack over that time period running between 4V and 3.3 V.
Lots of wondering.

Great info on the other hand.

Wolf

@Korishan C-1A means current = 1A / 1000mA. That was the current set of all testing, since my objective was to filter cells that are still good enough above that discharge rate.

@completelycharged, no I did not measure each year, I only had the possibilities to measure capacity at the end of last year.
I think I will randomly test some of them in 6 months or so to see if there's any difference.

As for the IR, I'm hoping to get or build something accurately enough to test that as the only thing I could do now is the quick IR test with the Opuses.