Beginner problems regarding power supply hardware

Hey everybody,
im new to arduino and was building my first stepper circuit today. I noticed, that the motor was recieving not enough power from the connected 9V to work properly, so i hooked up a 9VA1 Adapter instead. Then it worked fine.
Question 1.
On the adapter is written: INPUT: 100V-210V. Thats refering to the voltage out of the socket right? And the Output would be 9V im guessing. So the adapter transforms the Voltage to suit the needs of my arduino. Is that correct?
Question 2.
You guys have any idea, why my new battery cant power the stepper motor?
Everything in my circuit seems to work fine, when the 9VA1 adapter delivers the Voltage. Maybe the battery was used before and cant deliver the needed Voltage?
(The voltage of the battery was slowly declining, as it powered the Motor)
Beginner knowladge regarding the topic would be great!

Thanks in advance!

Welcome to the forum

Q1 : Yes

Q2: Is this a PP3 battery ? If so it simply cannot supply enough current to power the stepper. You obviously noticed the falling voltage

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Very strange, in the tutorial video i watched, the guy used a V9 battery aswell. Looking foreward to try it out with adifferent V9 battery.
Thanks!

For some reason a lot of videos and tutorials show a PP3 battery .
These batteries can only supply a small amount of current fit a limited time and so are unsuitable for project where there is any load on the project ( stepper motors, dc motors , relays etc etc ) .
It’s better to do what you did - use an adapter , or use AA type batteries , you can holders for these on eBay ( 3 will give you 4.5 volts , enough to power an Arduino via the 5v pin)

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