When both the Arduino and Esp are connected to a laptop it works but when we put it on a powerbank/battery it does not. Please help us 
what Arduino?
Powerbanks often have a feature where if the current drawn is below a particular level, the powerbank will automatically shut off. This is because they are designed to charge the internal batteries of other devices such as smartphones and as the smartphone's battery gets full, the current it draws will drop, and this will trigger the powerbank to stop charging it.
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Powerbanks can turn off when not enough current is drawn. Measure the voltage.
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Hi @swish16
welcome to the arduino-forum.
What exact kind of battery?
What does it exactly mean if you write
when both the Ardiuno and the ESP are connected
As long as only one of them is connected to the power-bank it works?
or something different?
@swish16
This topic is a lot like
Same effort is it?
^^^
Uno
You should provide precise information.
ESP8266 nodeMCU is pretty good. Still there are different versions
- from different manufacturers
- with different numbers of pins
trying to power the ESP8266 from the arduino is a bad idea.
More precise information
your sketchy shows B1, B2, B3, B4 are these 4 pieces of these
4,2V 4200 mAh Li-Ion-batteries?
Are the batteries connected in series creating 16,8V or in parallel? creating 4,2V?
The microcontroller-world is not superstandardised like USB-devices.
You have to take of more details than just
"does the plug fit into the socket?"
an ESP8266 draws a minimum of 30 mA current.
but ca have short current spikes 300 mA high which the arduino can not deliver.
What exact circuit you need for the powersupply dependson the details asked above.
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