Voltmeter connected to a consumer powerbank

>put it in parallel between the two wires that connect the cells to the powerbank's circuit board. Would that work?
Yes.
>Would the display work even when charging / discharging?
Yes
>Would that damage it?
No. A good volt meter has high impedence and has very little effect on circuits.
>Should I put it in series instead?
No, series is to measure current and would require a low impedence Amp meter

File: v1 powerbank.png (19KB, 1000x572px) Image search: [Google]

19KB, 1000x572px

>>1191689
I meant something like this, to attach to the dash of my car (I'm not connecting it to the car's main battery, but instead to a powerbank that it's supposed to be hidden behind the radio):
https://www.amazon.com/RioRand-Waterproof-Digital-Voltmeter-Motorcycle/dp/B009XQKCQY/ref=sr_1_10?ie=UTF8&qid=1497198590&sr=8-10&keywords=volt+meter


And the setup would be like pic related
Instead of splicing the wires, I was thinking of soldering the voltmeter in parallel directly on the terminals of the circuit board, it shouldn't matter right?

>>1191685
literally buy a $1 volt meter and connect the red wire to the red one and the blue/black one to the blue/black one

>>1191711
Yes that's the plan

How much current would you say it would draw? Can I keep it on 24/7 (on a 10000mah powerbank)? Or should I add some sort of button in series to toggle it on only when I need it?

>>1191714
check up the specs of the voltmeter how much current it draws

>>1191714
Yes you better put interrupter in serie with display. You can also change/place a resistor in serie with display to limit current if it is possible