What Would You Do? 2010 Failing Battery

Hi all! First time caller, long time listener

So recently I've been doing maintenance (struts, plugs, 12v, coolant, egr, tranny fluid, brake fluid, MAF, and HV fan) on my 2010 Prius w/ 150k miles. I'm fixing to go on a long trip (2 or 3 weeks across America) and want to make sure I don't have any problems. The previous owner (I bought it with approx 130k miles) had a dog and the HV fan had 1/4" of dog hair in it which got me worried about the condition of the traction battery. So I bought an OBDII reader and the Dr. Prius app which confirmed my fears of battery degradation. The app said I have 37% battery life which according to their standards is failing. The system isn't throwing any codes yet and I'm getting between 43 and 45 mpg in the summer. My question is, would y'all try to recondition the battery using the Prolong system or just buy a new battery? I have a hard time stomach paying 700 bucks for the prolong system when I could buy a new battery from newpriusbatteries for 1600. At the same time, I don't want to throw money at a problem that doesn't yet exist. I also don't want that problem to pop up in the middle of my road trip. I plan on owning this vehicle for as long as possible.

Thanks!