Given the wide range of actuators and electronics which go into a robot, choosing the right battery may not be an easy task. This article guides you through the thought processes involved in choosing one or more batteries for your robot. NiMh Batteries LiPo Batteries …

@Yash Gupta You might want to start with the battery physically outside from the robot (so the robot does not need to lift the weight of the battery), meaning you can use any normal 6V pack (NiMh for example). If you need the robot to support the battery, it would need to be ligh…

Hi sir, Can we find how long a battery can run a load(LED/motor etc) by knowing just Voltage in a battery(V),Current drawn by load(I) and WATT of l load(w), For example: A 9V battery(Non Rechargable and mAh is unknown) is connected connected to a LED which in series with 100 ohm…

@Akshay Theertha If the capacity and discharge curve are unknown for that battery, you’ll need to do experimentation; measure the current draw and the voltage and time how long it takes. The current draw should be steady with a fixed load.

@Coleman Benson , Sir if i know just mAh (say 500mAh), then will it be easy to calculate the time right? like current drawn by led is 25mA, soo (500mAh/25mA)= 20 hours?

@Akshay Theertha That would be the correct “napkin math” assuming the discharge rate and voltage were linear. In reality, you’ll get a percentage of that. Therefore you might make that calculation, assume you might get around 75% of that (so 15 hours), and then test how long it a…

Hi sir, my small dc motor is running by a Li-Cd battery of 1.2V, 600mAh, current drawn by motor is 40mA. soo 600mAh/40mA=15 hours, soo it can run upto 9-10 hours. And what i understood is if i connect that battery with another battery of 1.2v, 600mAh in paralell, then the Amp…

@Akshay Theertha The effect of series / parallel is to either increase the capacity or the voltage. This is how battery packs are made. Remember, the theory is different than reality since discharge is not always linear as the battery voltage drops.

I am deigning a tracking device using arduino uno and sim900 gprs shield. using two 3.7v 2200mah batteries in parallel … my device runs for 7hr . I am sending sms and to thingspeak 2 times i an hour. I want to minimize the current consuption so that my device will run for at lea…

@ALEKOS DIGITAL Using GPS constantly consumes quite a bit of current - can you see if connecting to the GPS only when needed (twice per hour) helps? If not, you might just need a larger battery pack, or add three such packs in series.

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akshaytheertha June 18, 2018, 2:38am 218

@Coleman Benson,
Yeah Thank you sir!