3 ms·Get an ODB2 reader and check the battery condition before you buy.by timbit42 3y agoGet an ODB2 reader and check the battery condition before you buy.mmikeff 3y agoThanks, I'll look into thattimbit42 3y agoI should mention the Dr. Prius app, which is not limited to the Prius. The Dr. Prius website lists ODB2 readers that are able to access the battery data. Some single-board ODB2 readers can't.