All battery's have a max discharge rate, and if you go past that packs dump early. With continued, extended use like that the cells can be damaged. That is why after 1 run on 1 pack, and 2 runs on another I hung up the 2/3As. If I was going very slow all the time the 2/3As could give about 5 min to 10 min of run time. If any high RPM was used, they dumped VERY fast.
With a standard 540 motor, the 2/3As are a great choice. Good run time, can fit more cells in a smaller package, easier to fit where you want, and much cheaper than sub-Cs. Even with a brushless motor you will not see any ill-effects out of the 2/3As.
The design of the puller is such that it creates a VERY strong magnetic field, which is why you get such great torque and low end control out of a low turn motor. This also helps give them almost 1800 KV (rpm/volt). However, to create this field it takes a lot of power. There are trade offs for everything we use in the crawlers.
Hope this helps.
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