# Can I use a power bank to supply my robot?

Good morning everyone Im new in this field of arduino and robotics i need your help please.

If im planning to use 12 MG90S servo motors that consume 400 mAh that in total is 4800 mAh; can i use a power bank of 10,000 mAh 5v to supply my robot?

if it is not the correct approach to use a power bank; how i should do it and what should i use?
Thanks for your time and i hope you can help me.
Have a good day everyone.

That should work fine. mAH is the amount of energy consumed in one hour. Since the battery pack (Power Bank) has 10,000 mAH it has enough capacity, 10000/450 = 22.22 it should keep your servo motor running. at 4000 mAH you have enough to keep you going 2.5 hours.

Careful...mAh and mA are not the same thing. Can you say where you got that 450mAh and 4000Ah from?

The stall current of an MG90S is 700mA and 12 x 700mA is 8.4A or 8400mA CURRENT (mA not mAh). The average current will be a lot lower but the power bank needs to be able to supply the peak current. It might have a total CAPACITY of 10000mAh but that does NOT mean that it is capable of supplying a current of 8.4A.

Many power banks, intended for phone charging, are current limited to 2.4A or less. You need the full specification of the power bank you want to use to tell if it's suitable.

Steve

I got the information of this servo motor from here :

I was wrong the website says it is 400 mA; Oh so the official stall current is 700 mA; so when i looking for a battery for what info i should look?, i was investigating that is better to uses a lipo battery.

If it is 8400 mA i should use one like this?:

10000 mAh, 7 v

if it is 4800 mA i should use this one ? :

5000 mAh, 7v

This is the power bank specs:

10000mAh capacity portable, 2.1A Fast Charge & Dual Port- Dual USB output port(5V2.1A,5V1A) , 5 volts

gilshultz:
That should work fine. mAH is the amount of energy consumed in one hour. Since the battery pack (Power Bank) has 10,000 mAH it has enough capacity, 10000/450 = 22.22 it should keep your servo motor running. at 4000 mAH you have enough to keep you going 2.5 hours.

Thanks for your answer Gil, i will keep investigating and have fun, it's time to learn.

RC battery banks are a better bet.

You can not use power blank, it usual only 5v 2.4a, servo 700mA x12 = 8.4A with 6v
You can use battery in power blank and use board 2s battery lithium bms 2s 15A-20A, power blank 10k mah usual have 4 x 2.600mah 3.7v , 7.4v about 5000mAh =5Ah, 7.4v x 5Ah /(8.4a x 6v) = 0.73h x60m =44m