BTW if you have a lipo capable charger, you might want to consider a Lithium Ion battery. I managed to get 2 pieces of 150mAh (if not 180mAh) of this lithium ion batteries.
I soldered them in a 2S (series) configuration and taped the ends to prevent accidentally shorting the contacts. The size of the finish product is the same size as the stock 1/3AAA packs... but will be giving out 7.2v minimum.
So far my Micro T runs faster and last longer (about 10mins at least) than the stock batteries (normally last about 5mins at most) . BUT I am not sure if the stock ESC can really handle it... although so far, there are no indications in my Micro T that it can not handle it. No glitch either.