[tc3_racer_001]

to charge them effectively they have to be both exactly the same (matched together, with similar specs) and be run down equally (ubec rather than the esc etc). apart from that, it should be fine BUT: i wouldnt recommend charging them up full. charge them for 80% of the time (dont think tcs works for nimh) then charge individually. this ensures one isnt overcharged and destroyed.

hope this helps,
ryan.