10440 protected batteries brought back to life

[Hash25]

Hi everyone,

I recently checked the voltage on 2 trustfire protected batteries and both had read at a zero voltage. I ten tried to use these batts in my Precise to confirm that they were in fact dead. The voltage should have cutoff at 2.70 volts I believe. However, I decided to put them in the chrger for a couple minutes to see if there would be any effect on them. Now they are reading 3.67 volts each. They seem to work fine. I will be cautious about charging them further as I am concerned they may be faulty. And far as the multi meter volt reader is concerned I do not think that it is the problem.

Any thoughts?

Thanks.

H.

 

[jwquantrell]

Hey Hash,

The reading that you got on your 10440's was due to the fact that for some reason the protection circuit had been tripped. Yes, by putting them on the charger it seems to "untrip" them and they are fine again.
That has been my experience anyway, but I am sure some guru will come on and either confirm or dispute me.

Regards
Jim

 

[Switched]

It might have been the onboard PCB that had tripped only and somehow it reset itself. As you stated, be very careful doing this, as normally a depleted battery is not supposed to recharge on a regular charger. The device (name escapes me) needs to be used in such situations, a battery analyser or something.

 

[Hash25]

Thanks for the replies. I just needed to know that other people were experiencing similar problems with the PCB.
Hopefully it was just the PCB and now I can charge them carefully again. I really did not want to buy anymore batteries since I have too many already. So thanks again.

 

[USinchains]

I've tested a few of them after running them to the point of cutoff and they did read zero. Charged them back up and used them as normal, no worries, the PCB is not allowing a reading to show. This is on a 2x10440 device, one reads zero after cuttoff (first one in the series) and the second is always around 2.7-ish, right before the listed cuttoff voltage.

 

[aschmidy]

I have had a few of my 10440s go to zero, one of my 14500s does it, too. I have a bunch I just rotate through. I just charged them back up and keep on using them. Haven't had a problem, yet.

 

[Hash25]

Yes I forgot to mention that one of my 14500 batts has done this as well. The thing is these batts never did this before and I have had them for a while so I was just wondering why they chose now to start doing this.

 

[Switched]

Are you using a LR atty with them?

 

[North Shore]

If a battery goes dead, I have used lower powered (320 MAH as opposed to 500 MAH) chargers to bring them back to life. There is a strong argument for getting rid of a battery that goes dead way too fast or multiple times.