LiPo - Cell Voltages

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6 years 6 months ago #14394 by 4Pedalsfly
LiPo - Cell Voltages was created by 4Pedalsfly
I would welcome opinions on following:
Turnigy 3S - LiPo 3,300 mAh had little use and stored at 3.85V per cell when not in regular use
and always balanced charged.
Despite several attempts at Balance Charging it records cell voltages of 4.20 , 4.13 & 4.20.
Decision to be made, bin job or use ?
Thanks
Colin.

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6 years 6 months ago #14395 by MikeSeale
Replied by MikeSeale on topic LiPo - Cell Voltages
Since you've charged it you might as well use it. After the flight check voltages again to see whether you're right to be worried.

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6 years 6 months ago #14396 by kevinross
Replied by kevinross on topic LiPo - Cell Voltages

4Pedalsfly wrote: I would welcome opinions on following:
Turnigy 3S - LiPo 3,300 mAh had little use and stored at 3.85V per cell when not in regular use
and always balanced charged.
Despite several attempts at Balance Charging it records cell voltages of 4.20 , 4.13 & 4.20.
Decision to be made, bin job or use ?
Thanks
Colin.


In addition to reduced cell voltage, you verify a cell has deteriorated by checking its internal resistance. Many modern chargers have this capability. A new cell should be ITRO 2/3 milli ohms and a cell will continue to work well up to 10 m/ohms. You will notice a significant performance drop > 20m/ohms

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6 years 6 months ago #14397 by Phil Ford
Replied by Phil Ford on topic LiPo - Cell Voltages
I can check your internal resistance Colin with my charger Colin.

If resistance is within reason keep using it and get as much use out of it as possible. ;)

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6 years 6 months ago #14398 by Brian
Replied by Brian on topic LiPo - Cell Voltages
Thanks Kevin, I didn't know about internal resistance and measuring it. Wish I'd known before, I've just taken four LiPos to the tip!

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6 years 6 months ago #14405 by Phil Ford
Replied by Phil Ford on topic LiPo - Cell Voltages
I checked Colins lipo and cell 2 was at 12 meghom with voltage 1 volt down. Bin job like my two 6 cell lipos for the Beast.:(

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