hay, during building first robot i had some difficulties with my power source , my setup was basicaly a start here robot but with arduino i used the l239d motor driver , my power supply was a ni-mh 9v rechargeable battery powering arduino, and 3 AA battery pack to the motor driver
THE PROBLEM:
my problem was my motors runing weakly, or slowly ( they are gm8 solarbotics motors ), this did inprove slightly when i switched to the battery source mentioned above .
THE QUESTION:
well, i picked up a ni-cd 4.8v 400mAh battery and used it as a power supply and replaced the motors with pololu micro geared motors and they worked fine , so in my next project i want to use 4 of these motors connected to the one motor driver (either l239d, or l238n) basicaly my question is how to increase amperage/ choose a sutable supply for all these motors? i mean i want rechargeable betterys , at about 4-6v with high amps and at a small size and lowish cost .
thanks for any help :)