Balance Charge taking a long time

[cutting42]

Hi All

I have a Core UAC50 and a selection of 2S Lipos from 4500 mah to 6800 mah in both saddle and stick pack form for my and my sons cars.

I always balance charge and in the case of the stick packs (IP) have done so from new. The saddle packs are Orion 90c carbons and Orion 50c Carbons second hand from users who claim to have balance charged from new.

Recently the balance change for half of the packs has been taking the full 90 minutes (timer cutoff) but seems to have reached capacity much earlier.

Does anyone have any suggestions? The batteries still work great and I typically only take 1500-2000mah out of a pack (2 heats) and do not top up.

Is this a charger problem? Are the batteries damaged? Should I extend the time cutoff so the charger finishes correctly?