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Do you have a volt-meter? Measure each cell and see if they're close to each other (IIRC as you measure each end of the balancer tab the voltages are additive). When fully charged, each cell should be 4.2v MAX...and they should be all the same regardless.
I did just see one where one of the cells was basically dead...the other two would charge to 4.2 (resulting in a 8.4v pack that just wouldn't work well). We kiboshed that pack right away.
Measure it....don't guess.
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