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Old Mar 26, 2004, 01:57 AM
Batty is offline
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Born to Ride

Lipo Battery voltage too low


I have a 3s3p TP 2100 Lipo pack and by mistake I left it connected to my speed controller in the plane for 4 days. Although, the switch on ESC was off, it still drained my battery and now my Triton charger is unable to charge this pack. It keeps on saying the battery voltage is too low. I checked the voltage on each cell and sure enough, its showing 2V.

My question is that is there any way I can bring back the pack to life?

Thanks in advance.

Batty
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Old Mar 26, 2004, 02:36 AM
Joe Ford is offline
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Castle Tech
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Have you tried a lower charge rate? Say .5A?
Old Mar 26, 2004, 03:26 AM
mjdoz is offline
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Barry,

If the cells have dropped below 3V at rest then you are required to charge at 1/10C to bring them back upto 3V per cell. Once at 3V you can then charge the pack normally.

If you have limited resources then you may have to be creative on how you do that. These are NOT suggestions just thoughts and any may end in disaster.

if the cells read 2V then the pack voltage is 6V this is the same as a 2S pack at discharge

Most NI? charges can be set to very low charge rates

Of course as soon as the pack reads 9V it can then be charged under supervision in the normal way. The only creative thing is to get it to 9V.

Anything that you try is risky so take the normal precautions when doing risky things and watch very carefully for any signs of danger.

Michael
Old Mar 26, 2004, 03:26 AM
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Can we get this issue put in a big red sticky on the forum???

We've had at least 3 of these in the past week, that I've read.

WJ
Old Mar 26, 2004, 09:27 AM
Charlie Wang is offline
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Batty,

Set the Triton to 7.4V/1Amp, you can charge the pack to 8.2 - 8.4V, then try again with 11.1V/1Amp setting.

Repeat the process if the charger stop charging.

Regards,
Charlie
Last edited by Charlie Wang; Mar 26, 2004 at 09:35 AM.
Old Mar 28, 2004, 12:57 AM
Batty is offline
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Thanks guys, I'll try it tomorrow.
Old Mar 31, 2004, 07:59 PM
Pmagall is offline
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So Batty,

what happened?
I'm curious because, that also happened to me, the same way, and they here brand new etec cells.
2s2p 1200, and my schulze charger refuse to charge them (warning wrong cell count), and the voltage were 1.5v.
So Iím afraid, their really dead.

Paul
Old Mar 31, 2004, 08:22 PM
Batty is offline
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Born to Ride
Okay,

Good news. I tried it on one 3s cell. I charged it at 7.4V/1A and after a few minutes, my Triton complained that battery voltage is too low. I kept on resetting and repeating this process and each time, tiny amount of current would be pushed in. After 4 tries, the voltage reached > 7 volts or so. I then used the 10.8V setting of my Triton and charged it to 10V. After that it was charging like normal.

During the whole time, the battery did not even get warm, therefore I'm sure that no damage occured. Now I've to bring back the other two packs.

Good Luck and Thanks Charlie for suggesting this trick.

Batty
Old Mar 16, 2008, 02:11 AM
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Guys,

The same thing happened to me with Electryfy 1250mAh 11.1V

Helllllppppppppppppp
Old Mar 16, 2008, 02:44 AM View Post
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Old Mar 16, 2008, 03:31 AM
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Guys,

The same thing happened to me with Electiryfy 1250mAh 11.1V

Helllllppppppppppppppppppppppppppppppppppppppppppp pppppppppp
Old Sep 11, 2010, 05:30 PM
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Hey,

I'm not sure if this was the safest thing to do, but here's what I did.

I, too, had discharged my LiPo battery pack such that it was reading about 1.5 volts per cell. My Triton EQ refused to charge it. If I set it to charge to 7.4 volts, it would complain that the cell voltage was too low. If I set it to 3.7 volts, it would "charge" for 2 seconds, and be done. So here is what I did:

1. Disconnected the balancing lead
2. Set the charger to charge a NiCD battery at 0.1 amps
3. Let it charge for 5 minutes.

After that, I manually stopped the charging, reset the Triton EQ, and charged the LiPo battery as normal. Everything seemed to work fine.
Old Sep 11, 2010, 06:19 PM
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There is a Sticky

https://www.rcgroups.com/forums/show....php?t=1074181
Old Jan 25, 2015, 07:55 PM
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Thank you for that tip!


Quote:
Originally Posted by vorlynx View Post
Hey,

I'm not sure if this was the safest thing to do, but here's what I did.

I, too, had discharged my LiPo battery pack such that it was reading about 1.5 volts per cell. My Triton EQ refused to charge it. If I set it to charge to 7.4 volts, it would complain that the cell voltage was too low. If I set it to 3.7 volts, it would "charge" for 2 seconds, and be done. So here is what I did:

1. Disconnected the balancing lead
2. Set the charger to charge a NiCD battery at 0.1 amps
3. Let it charge for 5 minutes.

After that, I manually stopped the charging, reset the Triton EQ, and charged the

LiPo battery as normal. Everything seemed to work fine.



I too had a couple of 3S batteries that was beyond charge. I was told to recycle it as they were trashed! These were my first experience with LiPo batteries so I refused to believe that. After taking your advice, sorta, I removed the balancing plug and switched to NiMh. Charged battery at a low rate (0.5) amp for about 20 min. I went from 1.5 v per cell to 3.7 v per cell. Then I reconnected the balancing plug and re selected LiPo Balance. The charger is now happy. I took my time and I'm happy to have saved my two batteries. Once again thank you for your tip. From a newbie to the hobby.
Old Jan 25, 2015, 10:54 PM
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Time will tell.


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