I got back into PCPs several years ago when portable compressors appeared. I didn’t like the idea of constantly driving somewhere to fill up a tank.
Then after using a compressor that required an electrical outlet or car battery I reconsidered getting an air tank.
What appeals to me with this compressor is no plug in or external battery. It also takes up less space than an air tank.
When in the field, I won’t have to waste time with connecting a compressor to the car battery and starting the engine.
There is a battery store in the local area. I will take one of the batteries there to see if I can get a couple more spare ones that are compatible.