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3.3. Batteries

With NXT, there are two basic battery power options: the NXT rechargeable battery pack and 6 AA batteries. Both of these can have an effect on your robots ability to go straight and the reach the desired position.

3.3.1. Replaceable Batteries

In the early days of LEGO MINDSTORMS, the original RCX used only AA batteries. You could use rechargeable batteries, but there wasn't a rechargeable battery pack available like the current NXT has. Before the built-in rotation sensors, like in the NXT servos, many teams would try to use time as a unit for navigating straight, but they soon found out that time is a horrible unit of measurement to use for moving, and AA batteries it made it even worse. Since the motors run differently based on the battery power level, the robot was completely unpredictable. The results changed as the batteries drained.


  

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