Co-author of CanZE. Q210 nov 2013
I don't know. Basically we're pulling that data from the battery computer and that's it. 1-2 kW is almost impossible for pure balancing. If you have ever seen the pictures of the guts of the battery pack Some pictures of the battery you will notice the balancing wiring is tiny and the balancing hardware is not impressive, i.o.w., it's doing that very slowly and with modest currents. However, the firmware that showed the fast falling SOH kept the battery charging on 99% for a very long time too, which everybody attributed to balancing. In theory it could be massive charger inefficiencies when it pushes very low currents but I am not convinced. But as said, I don't know.