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Old Mar 26, 2012, 08:03 PM
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Just discharging the whole pack a small amount through the main leads would be the easiest way to get the one high cell to a lower level. Have you had high cells with other 6 cell packs? What charger are you using?
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Old Mar 26, 2012, 08:34 PM
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Quote:
Originally Posted by Turner2 View Post
Just discharging the whole pack a small amount through the main leads would be the easiest way to get the one high cell to a lower level. Have you had high cells with other 6 cell packs? What charger are you using?
I have an icharger 1010 and a 106.
All of the 6s are over on one cell as well, and I generally charge them on the 1010.
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Old Mar 26, 2012, 11:39 PM
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Have you used any other means, other than the chargers, to verify the voltage on the high cells?
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Old Mar 27, 2012, 06:59 PM
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Quote:
Originally Posted by Turner2 View Post
Have you used any other means, other than the chargers, to verify the voltage on the high cells?
I have used an eflight cell checker. All so overall battery voltage with volt meter
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Old Apr 11, 2012, 12:58 AM
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every thing iv read so far was on 2 and 3s batt packs. I have a 3000 mah 4s that has LOW VOLTAGE .... using ni-mh what should i be charging to? like i read the 3 cell should say 3.25...........what should a 4s 3000mah say?
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Old Apr 11, 2012, 07:15 AM
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Quote:
Originally Posted by HEATEDHAT View Post
every thing iv read so far was on 2 and 3s batt packs. I have a 3000 mah 4s that has LOW VOLTAGE .... using ni-mh what should i be charging to? like i read the 3 cell should say 3.25...........what should a 4s 3000mah say?
They are saying each cell should be 3.25V
4s x 3.25 = 13V

But it is better to also check each cell for voltage along with the whole pack. If it were mine, I would charge it to 11V and then check each cell. If they were close in voltage I would then charge it to 12V and check again. If they are still close I'd then charge to 13V. After that I'd use the LiPo charge.

IMPORTANT!! Do not charge a lipo on a NiMH setting unattended.

Remember, low voltage packs can be damaged goods so treat them appropriately.
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Old Apr 12, 2012, 06:52 AM
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To add to what Hoppy said, I usually charge it JUST long enough to get the lipo charger to accept the battery again. This usually does noA t take very long at all. A 1-5min. Charge at the lowest amperage possible when bringing it up, and continue with a low amp charge once switching to the lipo charger.
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Old May 13, 2012, 11:23 PM
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thank you OP!!
i am the new starter of flying, these are really what i need!!!
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Old May 26, 2012, 02:10 AM
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I have 3 lipos... 2 - 2200mah 3s and 1 - 3000mah 4s. I bought them a year ago and the have lived in a soft material lined aluminum case along with around 10 other batteries. I have around every 3 or 4 months put them all on balance charge to top them up. The three aforementioned batteries have never been used, but become puffed and completely dead some time in the last 3 months... I mean by dead the cell tester won't even light up. What happened do they have a shelf life and why didn't any of the others (some older) not do this? Any help would be appreciated.

Larry
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Old May 26, 2012, 11:30 AM
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They do have a shelf life but additionally they should not be stored fully charged. LiPo's should be stored at approximately 3.8-3.9 volts per cell. The exact voltage is not important as long as it is near the 50% charge level. Storing fully charged or near the lower limit of 3 volts per cell are both bad and cause accelerated damage.
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Old Jun 04, 2012, 06:29 PM
I think I'm inverted. Maybe.
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I don't have a NiMh charger that I can adjust the current/voltage on. I do have a NiMh charger that can either put out 9.6v or 4.8v. For a 2S battery, would either of those work?
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Old Jun 04, 2012, 07:07 PM
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What is the voltage of each cell now? If you don't know that, what about the pack voltage?

Next question - what is the current output from the chargers? Is it variable?
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Old Jun 04, 2012, 07:38 PM
I think I'm inverted. Maybe.
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I think both cells are sitting at about .8 volts. The charger is an old Hitec NiMh charger for my 72mHz. It charges at 80mAh. If those don't work, that's fine. I'm getting a better charger soon that has NiMh capability. I just don't know the optimal voltage for jumpstarting a LiPo.
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Old Jun 04, 2012, 10:47 PM
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That's very low and the cells are probably irreversibly damaged.

I'd replace the pack. I don't recommend it but the tx charger could be used to get the cells up to 3.2v/cell..... when doing this, you have to monitor the voltage continuously so it doesn't go much above 3.2v/cell. If the pack has or does puff, don't even try this procedure.

Be careful, the pack is now damaged goods and therefore more dangerous to use.
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Old Jun 12, 2012, 02:36 PM
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evening gents/ladies'
I am at present trying to recharge a cheapy hong kong 2200 2s battery that I stored fully charged about a year ago and forgot about, due to moving house the output from the pack was about 2.4 volts so pretty knackered , so if it charges up all well and good if not it goes into the recycle bin at work....... Iconnected it to my old JP (celectra) 1-3 cell charger , the output was so low the cells wouldn't accept a charge and the charger went off line... I then thought I'd try charging as a single cell lipo and see if the cells would take a charge.... this they did ...left it on the charger for 15 minutes,charging at 500 m amps then flicked the cell switch to 2 cells ....didnt work the first couple of timesbut eventually the charger went on line .... I am sitting here watching the voltmeter sitting around7.7 - 7.8 volts , the charger is working and hopefully I'll have a charged cell back. It is however not staying indoors tonight....
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