I have a 2008 Prius with 80K miles. The original battery voltage has been on a slow decline for several months. In December, 2011 (last month!) I ordered an Optima Battery Kit from eLearnaid.com. This is my second battery from them; the first was in my wifeâ€™s 2006 Prius, back in December 2010. The battery arrived in its usual protective shipping container. After unpackaging, I checked the voltage and it was 11.1 volts and 44% of charge. I went ahead and installed it and put it on a 2 amp charge overnight. I send eLearnaid.com an email and explained the batteryâ€™s condition upon receipt. Bernard Littman responded to my email and said that â€œYou are the second person who has reported this to me. I am not sure what is going on.â€ He requested that I send him the serial number off the sticker, located on the side of the battery. The sticker was not visible and would require removal of the battery to view it. I advised Mr. Littman that it would be several weeks before I would have the opportunity to remove the battery, get the number and reinstall the batteryâ€¦ I was able to pull the battery this morning. I took some pictures that show the static voltage in the 11â€™s. I also put the Prius into diagnostic mode to use its onboard voltage/signal checker. There are two readings, 11.4 with nothing turned on and 10.8 with the headlights on (they are HID, so they draw less voltage than a halogen system). I failed to click a picture, but when applying the brakes the voltage dropped to 10.4. After removing the battery, I attached my load tester and got 11.8 volts static. With a load it dropped to 9.5 volts. I sent Mr. Littman an email a few minutes ago, with pictures attached. I explained that this is not acceptable and that I needed another battery. I will update this thread as I receive info from him.