Lithium battery capacities (18650).

Dec 21, 2014 2 Replies
I

Having discovered that recycling bins in various shops are a good source of lithium battery packs that can be put to various uses, I notice quite a spread in claimed Ah capacities on the information labels.



The first aquisition was labelled "5.2Ah" - there weren't any parallel combinations as it contained an uneven number of cells.



The next rescue was marked "4.2Ah", and contained 3 sets of parallel pairs - so I assume the individual cell capacity is 2.1Ah.



The next was lowest yet at 2.0Ah.



This seems to be quite a spread for apparently identical cells, so I'm wondering if I'm missing something?!



Thanks for any help.


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J

hi,

chinese manufacturers are prown to mark everything they want on battery capacity between 1 and 2 times the real capacity. it seems to be a constant from clone batteries

2 Ah for a 18650 battery is a good value to trust. then there are devices that measure it, it's always a good tool if you save batteries from trash.
Jean-Yves.
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I

A capacity tester is probably a long term round-tuit.

The up and running application is an E-cigarette, the cells claiming to be

5.2Ah last a whole day and well into the next (if I forget to change over in the morning).

There's a 2P3S pack claiming to be 4.2Ah that I'm wondering whether to leave the parallel pairs intact.

Another round-tuit job is the discount store 5W LED handlamp that keeps self discharging if I don't leave it permanently on the charger - the information leaflet claims a 2.2Ah capacity cell.

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