Seen this on a couple of Trakpower 4900's when they were "new" on the scene last year. I've had mine since Nov 07 and they are always charged on my cheapo Ansmann Deluxe (!) charger with an inline Trakpower V-balancer module. So far no problems at all, don't know if its luck or the V-balancer but I'll just keep doing more of the same.
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