First off, rechargeable please. Does not matter in the type "AA, AAA, etc".
But must be smaller than a car battery, please and thank you
What kind should I get for powering a robot? Specifically 3-12V DC motors.
As well as around 7.4 volts for microcontrollers and sensors.
I see there are a bunch of different kinds "Ni-MH", "Ni-CD", "Li-ion", etc..
Which is best for this situation? What are the differences.
What is the "going rate" per 1Ah?
Also I am looking for a single or at most two batteries. I don't want single AA batteries that I have to remove one by one and put into a charger.
Also where do you suggest I buy from? Do you have a particular store/website you know is good?