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Old 12-16-2011, 01:18 AM #1
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Unhappy Failed 18650?

Hi all,

I recently bought this laser from Lazerer, I bought it with the battery and charger.

I just revived it today and upon trying it out it seemed to not work. Curious I tested the battery, it was reading .1v on my multimeter. When I put it in the charger I get a green light as if it was fully charged.

Did I receive a defective battery?


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Old 12-16-2011, 04:16 AM #2
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Default Re: Failed 18650?

Nope;

If it is indeed receiving the charging voltage (tested by the meter probes on the cell while in the charger) . . .

then the cell has either opened the pressure relief device,

or is defective.

Is there a brand name on the cell ?

I am convinced that Panasonic & Samsung make quality, U.L. tested cells.

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Last edited by LarryDFW; 12-16-2011 at 04:22 AM.
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Old 12-16-2011, 04:19 AM #3
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Default Re: Failed 18650?

IIRC All the batteries from lazerer are ultrafire.

I'm betting on a defective cell.

Nope586 order a good quality cell... from Larry, lighthound, or anywhere else, but trusting xxxxfire batteries is a losing proposition.
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Old 12-16-2011, 04:40 AM #4
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Default Re: Failed 18650?

I have done this and it works most of the time.

1.if you have a bench power supply set it to 4.0 volts
2.put that on your "low voltage" cell just like you were
going to charge it.
3.only leave it on there for about 15-20 seconds this
will put a surface charge on the cell so when you put
it in the charger the charger will start charging it.
4. put cell in charger and look for the red light.

Be sure to check the cell well for mechanical problems
before trying this procedure, you don't want to blow
up something indoors.
I have never had that problem with this procedure.


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Last edited by Flaminpyro; 12-16-2011 at 04:44 AM.
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Old 12-16-2011, 05:45 AM #5
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Default Re: Failed 18650?

^Yeah, sometimes you can resurrect dead batteries with procedures like this, but they'll never have the same capacity.
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Old 12-16-2011, 11:22 AM #6
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Default Re: Failed 18650?

Quote:
Originally Posted by Flaminpyro View Post
I have done this and it works most of the time.

1.if you have a bench power supply set it to 4.0 volts
2.put that on your "low voltage" cell just like you were
going to charge it.
3.only leave it on there for about 15-20 seconds this
will put a surface charge on the cell so when you put
it in the charger the charger will start charging it.
4. put cell in charger and look for the red light.

Be sure to check the cell well for mechanical problems
before trying this procedure, you don't want to blow
up something indoors.
I have never had that problem with this procedure.


Happy Holidays
Jerry is right,

I do this all the time with Li-Ion batteries for mobile phones. Most of the users seem to discharge or leave the batteries not charged for LONG LONG periods of time when the charge circuit in the phones simply can't charge the batteries.

So I hook them up at a bench supply at lower volt as 2 volts or 3 for 10-30 seconds and then they can be charged with the charger.

On the other hand the cell's protection circuit might have blown off. I had one case like this I had to replace the protection board.
Or you could simply remove it and make it an unprotected cell (that's sometimes dangerous)

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Old 12-16-2011, 01:16 PM #7
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Default Re: Failed 18650?

Looks like it really was a bad cell, oh well.

I lucked out as I still had a new 12" PowerBook battery for my old broken PowerBook that I don't need anymore. I figured I had nothing to loose so I ripped it apart and low and behold it had 6 18650 cells in it. So I get them out (very easy to do btw) charge one up and now the laser is working perfectly.

Thanks for the help all!! : )

Also the Lazerer Classic#650 is awesome!!!
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Old 12-16-2011, 04:17 PM #8
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Default Re: Failed 18650?

What FP describes is the procedure for resetting the protection circuit on protected cells. I believe only a brief connection is required, but to be honest, I've never had a protection circuit kick in. I treat my cells too nice, I guess
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