I've had no problems in charging anything from 29 to 33 cells with the HP charger John.
My Torq Radical 39.6 volt batterey is an eZee NiMh 10 Ah battery with three of those Ansmann 8000mAh cells added when it was 10 months old on the basis that the original cells would have lost some capacity in that time, and it's performed perfectly for over a year now.
I pre-charged the three cells before adding them to the charged battery, then ran it gently the first couple of times, neither fully charging or discharging it, to get the cells to gradually match. During the first month or so of use, the battery's performance increased as the cells settled in.
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