Dead AW' Prot 17500: Lesson Learned.

jumpstat

Flashlight Enthusiast
Joined
Dec 20, 2006
Messages
2,419
Location
Ampang, Malaysia
Hi to all,

Lesson learned.

Freshly charged 17500 in an M3/KL2 head/Z48 and it has a beam cover (FM17) installed. Last night I did my usual weekly maintenance of all my lights. When I got to the above referred light, it failed to switch on. So I took the batts out and popped it into the WF-139. One battery failed to charge. :ohgeez: Ahh...so I did a check on the charger and swapped the batteries and yep, something was wrong with that particular battery. Then my heart skipped a beat :sigh:. I hope the head which is actually the KL2 X464 Milky was all right, and it was confirm to be ok when I tested the head with other batteries. Phew....:sick2:
Took a fluke multimeter and tested the suspected battery...yep dead as a door nail. :mecry: Wonder what has caused it to die prematurely. :thinking:
Upon further investigation, I found out that the night before, my wife who was out with her friends came back and wanted to use a torchlight as her earring dropped on the carpet. She said that the first light she took was the M3/KL2. She tried to switch on the light but no light came out from the front end. Her mistake was that she did not open the beamcover! :ohgeez::sick2::thumbsdow no wonder no light came out. I suspect that the light was on when she put the light down to get another light and thus I am pretty sure that it drained the hell out of the batteries. Just imagine getting drained by a X464 Milky head. :shrug:

So there is pro and cons using a beamcover. If it was a beamshaper installed, this issue would have been avoided.....lucky for me it was just the battery that's dead not exploded or worst !!

" Win some loose some "
 
I think you'll find your cell isn't dead - the low-voltage protection cut in, and that is why it seems lifeless.

Connect it in parallel for a few seconds with another cell. Use a nearly-empty cell for this, reading ~3.7V, not a full one.

This should jolt the protection circuit enough to bring it back to life, and you should then get a voltage reading.
 
Hello Jumpstat,

In addition to what DM51 mentioned, I would advise you to buy your wife a light that is easy for her to use and is bright enough for her typical use.

My wife has access to all of my lights and I tell her that she is free to use any of them. We took some time playing with the various lights and she settled in on my ARC LSH-P with the 2 AA battery holder and Kroll clicky switch. This has become her light.

I keep it loaded with NiMh cells, but I have instructed her on how to replace them with Alkaline cells in the event I am not around to help her out.

It is interesting that knowing that is her light, she uses it all the time. She even tells me when it drops out of regulation so I can charge up the batteries. I think my flashlight hobby has had a positive influence on her.

Tom
 
My soon-to-be now knows how most of my lights work, no need to get into programming a nova, she already thinks i'm crazy. But anyways, her choice of lights was my P2D, it's just the right size for her hands (always a bit small for me) and she can put it in her purses without noticing it. I just have to keep the batteries fresh. :)
 
1 sec, then they are short below where protection kicks in? And 3.7V, because it is safer to use a 4.2 Li-Ion for this? :confused:
Cell feels the direction of current flow, i do not know the response time, but based on my experience 1secwas enough.

You can apply voltage from any other source. 5mA flow to cell i enaugh to turn it back on.
You can make it in series with resistor.
If you have wf-139 charger, you do not need to do anything. there is 10mA "tricle" charge in it, and it wil "start" the cell.
 
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for a cell reading ~3.7V open circuit on your DMM, a quick touch + to + and - to - to attempt to trip the protection back into gear shouldn't hurt anything. I would certainly not consider this dangerous in any way, you might get an amp or 2 to flow for a moment, no big deal.

However, I am not entirely familiar with the behavior of the KL2, if when the load is released by the protection the driver temporarily "stops" trying to pull current, then the protection should have kept trying to re-open as the voltage would spring back, which could cause a never ending loop of the protection kicking on and off over and over for hours on end, which could have destroyed it in theory.
 
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