Hitec took over multiplex lipo batteries and I had a bad Multiplex 7.4v 4000mah that I sent in to Hitec for repair.
I called them after confirmation thru USPS, and they said they received and were sending out the pack repaired.
I also received 3 days before the pack was sent a confirmation card they had the battery and it was being fixed.
From time sent in to getting back was less than 2 weeks.

By the way I also use HS5955TG and HS5645G servos. The 5955's have no slop, the 5645's has a very small amount of gear lash.
And I just ordered more 5955G's today.

Tony