How do I test battery when it's cold out and I'm on a dealer lot?

I'm shopping for a used gen 3 or v. I installed Dr Prius and took it to a test drive.
It got thru the charging phase in maybe five or ten minutes and then it wanted the battery to be 77 deg F to proceed with the test. I'm in the snow belt. We had the car out for a test drive for probably over 45 minutes, and on a day in the 50s (which is warm for February here), with highway driving, the battery never got past 72 degrees.

So, is there a way to check battery condition on Priuses when it's cold out and you can't necessarily run it all day?

 

I wrote the Dr Prius app folks, and got a speedy and useful reply... the app shows internal resistance and cumulative delta voltage readings on the battery blades. Even if the full test suite can't run, these can provide some indication of battery condition. After a bit of driving, they both should be very similar across all the battery blades, so if all the bars are showing 25 milliohms except for one showing 35, that's bad news. The resistance goes up as the pack ages, the indicator bars go yellow at 30 milliohms which is a kind of middle-aged range. On the cumulative delta voltage, again all the blades in the pack should be about the same, but I'm not sure what good numbers are, like if .1v is a big difference or not, but the bars do provide some visual indication.

 

Most of what I was looking at was under 120k, some under 80k, so mostly enough time to check the egr/head gasket stuff, and I was trying for 2015 or later and checking recall status.