I would not expect any extended usage out of pumps like this, they are truly light duty and I've heard more than one story of them melting.
Yes, they are significantly more expensive but check out the CyclePump from Best Rest Products
https://bestrestproducts.com , made by guys who put them to the test. I've carried one for years, moving it between bikes and cars. Has all the common connectors (Powerlet, cig lighter, SAE, alligator clips) to work on anything with a 12 volt battery.