sunhuxAsked:
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JohnBusiness Consultant (Owner)Commented:
The Powerbank is 3 Watt-hours and 19 Volts DC.

The Air Ionizer is 12 volts and "under" 1/12 Amp = 1 Watts.

So the Powerbank has enough current to power the ionizer for a short time.

You would then need a little box with a resistor or regular in it to drop the voltage.

https://electronics.stackexchange.com/questions/75448/how-to-reduce-dc-voltage-using-resistors

You would need about a 100 ohm resistor to drop 20 volts to 12 volts at 1/12 amp. It needs to be 5 watt resistor ( to be sure it can dissipate  heat).  

Basic equation here is Voltage (V) = Current (I) x Resistance (R).

Follow up note:  You can also make a little voltage regulator to do this. The article described this.
KimputerIT ManagerCommented:
Use this: https://www.aliexpress.com/item/DC-DC-4-40V-to-1-25-37V-12V-19V-24V-Adjustable-Buck-Converter-Volt-Step/32753318053.html?spm=2114.search0104.3.66.18f935557D24QJ&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_10890_319_10546_317_10548_10696_10084_453_454_10083_10618_10304_10307_10820_537_536_10902_10843_10059_10884_10887_321_322_10103,searchweb201603_6,ppcSwitch_0&algo_expid=ddf8ba25-d686-4d49-ae96-b45393d3c6af-9&algo_pvid=ddf8ba25-d686-4d49-ae96-b45393d3c6af&transAbTest=ae803_5

First connect the 19VDC connector to the input. measure the output voltage, while adjusting the dial. When it's 12VDC, leave it alone, connect the ionizer.

What do you intend to do with the ionizer anyway? Such a small device without a fan, basically has no use. Unless it's a full commercial device setup, you're wasting time and money for no measurable advantages.
Dr. KlahnPrincipal Software EngineerCommented:
According to the picture on ebay, the ion generator pulls 12V at less than 1W, so its actual current pull is less than 83 mA.  A 19V power bank capable of recharging a laptop battery should be able to deliver 83 mA for a long time.

So buy a cheap buck converter on the fleabay for less than a buck (one linked below) and as Kimputer says, adjust the output until it's 12V, then wire the buck converter to the ion generator permanently.

Do note that ion generators have two big drawbacks.  One, they cause every particle of dirt in the air near it to head for the nearest surface, so everything near it gets dirty.  Two, ozone, which damages your lungs and anything else organic.

https://molekule.com/blog/air-purifiers-ionic-ionizers-bad-or-good/
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JohnBusiness Consultant (Owner)Commented:
Can you get a 19 volt ion generator?    (Note:  I changed the voltage level in the sentence prior)

That may well be less expensive than adapting the one you showed above.
sunhuxAuthor Commented:
That powerbank can auto adjust its voltage of betw 9-19V   just that I dont have the right connection type.   may get several pcs to be powered by vinsic to gen -ve ions in a small bedroom
JohnBusiness Consultant (Owner)Commented:
Take these to an electronics store and ask for an adapter you can wire input into and output out of . Not hard with the correct adapter. Perhaps one adapter and connect the wires to your ion generator.  I did this with a car battery charger to get wires to the car battery

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