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BATTERY CALCULATOR

The Battery Calculator is designed to help you decide 'how much battery do I need for my robot?'

It is a supplement to the robot batteries tutorial. If you do not understand how to use this calculator, please read the tutorial first.

This calculator assumes the same battery is used for both motors (unregulated) and electronics (regulated).

Note that all entered values will be saved as a cookie on your computer (if you have cookies enabled) so you don't need to reenter anything on future visits.

Determine Motor Requirements (per motor):
Enter in your desired robot specs. You will need to look up the datasheet of your selected motor to find your expected current draw.
 Drive Motor Voltage volts Expected Current Draw amps # of Motors motors Time % Motors Used %

Determine Electronics Requirements:
If your robot has additional electronics, such as a microcontroller and sensors, enter that info here. Depending on your robot, sometimes this info can be insignificant. Check part datasheets or use a multimeter to determine current draw.
 Sensor Voltage volts Sensor Current Draw amps Microcontroller Voltage volts Microcontroller Current Draw amps Voltage Regulator Dropout volts

Battery Setup (pack means in series):
Remember, batteries connected in parallel add in mAh (for higher life and current output) while batteries connected in series add in voltage (for high voltage applications). To increase battery life, get batteries of higher mAh, and/or connect more of the same battery type in parallel.
 Voltage per Pack volts mAh per Pack mAh Packs in Parallel packs

Calculated Results:
Typical battery life states how long your robot will probably run before your battery dies.
 Total Continuous Power Draw watts Min Required Battery Voltage volts Idle Motors Battery Life hours Minimum Battery Life hours Typical Battery Life hours

Note that this does not account for your the physics of your robot. To calculate the distance your robot is capable of traveling with a particular battery, check out the Robot Energy Calculator.

Estimated Time till Completion in the Robot Energy Calculator must also be lower than Typical Battery Life in this battery calculator.