This said protected on the wrapper but when I looked inside this is what I found. Could the protection circuit be on the positive end? If so, can it be removed?
Protection on the negative end will have a strip running up to the positive sometimes.
No strip. Nothing added to the negative end. This cell is longer than a non protected cell. Looks like something was added to the + end but it does not move and I don’t want to get aggressive trying to remove it. Thought maybe someone here has dealt with this before and can recommend to leave it alone or rip it off. The cell is dead and I suspect the protection circuit tripped. Tried resetting it but no luck. Tried stupid charger but no luck.
Looks like it should be called an “18700” because it sure won’t fit into a 18650 parking spot.
The wire strip on the cells with negative-side protection is bringing power down from the top to supply the circuit board at the bottom.
In your cell with positive-side protection, the negative is made thru the case and circuit board power is supplied from the top button.
Acebeam has one like that. Protection circuit on top. It has usb charging though and it is actually 70mm long. It doesn’t fit in my other 18650 flashlights.
I decided to give up on any hope of reviving this cell. Wuben was good about sending a replacement fast as it was part of a flashlight/battery combo. Thanks Wuben.
Which Wuben flashlight did it came from?
I’ve had a few Wuben flashlights and also a few Wuben ABE2600 / ABE2600C batteries.
The older Wuben ABE2600 18650 seems to have an overdischarge protection (trips) at around 6 Amps, but when I tested the newer ABE2600C, it doesn’t trip at more than 6 Amps — I even tested on flashlights that use more power (I think about 10 Amps or more), but the newer ABE2600C didn’t trip either.
However, when I did a discharge test of my sample of ABE2600C (came from Wuben C3) using the SkyRC MC3000 charger, and set to 2.50v cut-off voltage - it will cut-off power when I discharge at 1A current (I think the low-voltage tripped at somewhere just above 2.5v (lower than 2.60v). But when I tried doing another capacity test at –0.50A discharge to 2.50v, it didn’t trip. So there appears to have LVP protection, but doesn’t have, or has a much higher overdischarge current protection threshold.
(Wuben ABE2600 came from an older Wuben LT35 — I don’t seem to recall the LVP triggering when I tested it before, but I tested only at –0.50A discharge to 2.50v and it didn’t trip before. Hadn’t tried doing capacity test at –1.0A discharge to 2.50v though, for the older ABE2600 18650)
It came from a L50.
It should be possible to open the positive end cap of your cell—it would be interesting to see the protection board. i would guess that it might use a P-type transistor for the switching element, and maybe a DW01-type ic for sensing and control component, but that remains to be seen.
Too late, already disposed of it. I did not want to start cranking on it. It looked well attached and the diagram gave no clues.
I know this is a few days old, and O.P. threw the cell out already but, I thought all of you would find this interesting.
It’s a video that someone took apart a very similar cell that was produced by BAK.
Here’s a thread about the removal of the cap from an Olight S1R cell:
That cell still serves me well.