Make A Battery Bank (for almost $0)

VK3ZYZ

Moderator
Staff member
As mentioned on the 80M net, I have picked up some electronic cigarettes. These devices are the single use versions and can often be found tossed out (or collected from a friend who uses them).
TheElecCig.jpg

The case is Aluminum with the ends pushed in.
Grabbing the mouth piece with pliers, and applying a bit of brute force, it can be pulled out.

MouthPieceOff.jpg

Then the "guts" can be slid out, or the other end removed and the pushed out.

TheGuts.jpg

Do not short the battery wires unless you want some fire! I did and it is pretty spectacular.
Cut the red from the battery, then the black. If you want, the pressure switch and heater can be salvaged too, along with any other parts you want. But I am just interested in the battery.

Battery.jpg


So far, I have about a dozen of these, so, with a suitable battery management board, a reasonably power supply can be built.
I've added a pdf of this FYI.
 

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VK3ZYZ

Moderator
Staff member
So far, here are the capacities tested...
867mAh (this cell was run over and flattened a bit)
1464mAh
1495mAh
1421mAh
1485mAh

next batch...
1444mAh
1474mAh
1559mAh
1400mAh

and the final batch I've tested...
1489mAh
1443mAh
1459mAh
So, you can see they are pretty good capacities.
 
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VK3ZYZ

Moderator
Staff member
ChargerCapacityTester.jpg

This is the charger/capacity tester in operation.
EDIT: The cells in this have been tested.....
1437mAh
1496mAh
1500mAh
 
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VK3ZYZ

Moderator
Staff member
So far, I have over 40 cells and the average capacity is 1.464AH, giving a total of 16.5AH.
Not bad for free!
Photo on 21-07-2023 at 3.05 PM.jpg
 

BillC

Active member
Good on you Denys, hope you can get some good use out of those batteries of cells. Cells can be very good to supply power for test gear when you want to avoid the noise and interference from modern switchmode power supplies, also if you want to isolate from the mains. Just think of all the wasted batteries of cells throughout the country. Maybe a sig. gen. could be a good project to use a few cells.
 
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