WARNING!!!! Don't try this at home unless you know what you are doing. Worse case you will burn something down with or without injuries and/or loss of property/life. You have been WARNED!
I bought a 3S 2200mAh 30C Grayson "Black" LiPo back in September. It only had about 4 flights on it and a cell went bad. It would heat up and the voltage of that cell would drop VERY quickly while the remaining 2 cells acted normally.
This evening I decided to carefully perform surgery on the battery. I carefully removed the wrappings and the bad cell was the last one connected to the black power lead. It was puffy and a check with a multimeter showed it was the bad one because the voltage was lots lower than the other 2 cells.
After carefully pealing back the kapton tape from the negative lead I simply clipped it from the bad cell and clipped the other bad cell lead from the attachment point on the middle cell (the new negative lead) then pealed the cell off of the adjacent cell slowly as not to damage the adjacent cell wrapping.
I removed the still attached piece of battery lead from the negative wire and balance wire.
I then carefully fluxed and tinned the "new" battery lead and attached the negative wire and balance wire to it.
Once certain I had a good connection I replaced the kapton tape and the other battery "bindings" i had removed.
Success, I now have a 2S 30C 2200mAh battery :applause:.
I simply have to put a large piece of heat shrink on it tomorrow to "case" it as the original was and test fly it.
The bad cell is in a safe location till it is placed in a bucket of salt water tomorrow for safe disposal.
Anyone have a old 2S balance plug you want to part with?
Thurmond
I bought a 3S 2200mAh 30C Grayson "Black" LiPo back in September. It only had about 4 flights on it and a cell went bad. It would heat up and the voltage of that cell would drop VERY quickly while the remaining 2 cells acted normally.
This evening I decided to carefully perform surgery on the battery. I carefully removed the wrappings and the bad cell was the last one connected to the black power lead. It was puffy and a check with a multimeter showed it was the bad one because the voltage was lots lower than the other 2 cells.
After carefully pealing back the kapton tape from the negative lead I simply clipped it from the bad cell and clipped the other bad cell lead from the attachment point on the middle cell (the new negative lead) then pealed the cell off of the adjacent cell slowly as not to damage the adjacent cell wrapping.
I removed the still attached piece of battery lead from the negative wire and balance wire.
I then carefully fluxed and tinned the "new" battery lead and attached the negative wire and balance wire to it.
Once certain I had a good connection I replaced the kapton tape and the other battery "bindings" i had removed.
Success, I now have a 2S 30C 2200mAh battery :applause:.
I simply have to put a large piece of heat shrink on it tomorrow to "case" it as the original was and test fly it.
The bad cell is in a safe location till it is placed in a bucket of salt water tomorrow for safe disposal.
Anyone have a old 2S balance plug you want to part with?
Thurmond
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