Hello, I'm new here so I hope this is the right place to post this. I have a 2005 prius and the battery went bad last November so I went searching for an inexpensive replacement. I found a guy on eBay that had a shop that offered one with an 18mo warranty so I got it and installed it myself. It went bad a few weeks ago and I called in the warranty and just installed the new replacement this week. Ever since then I've been having strange things happen. Sometimes when I turn it off and get out the car turns itself back on and I have to hit the button again, also the radio resets itself to stock and the auto window button works intermittently plus it's light blinks now which I'm not sure if it did that before. Sorry for the long post but I'm not sure what to do at this point. Any help would be great! Posted via the PriusChat mobile app.
I've never replaced it before, but I can check the cables on it. Posted via the PriusChat mobile app.
I don't know if it was the original, I bought the car used in 2015 from Toyota dealership Posted via the PriusChat mobile app.
I have a Bluetooth obd2 and torque and I'm reading 14v while the car is running. Posted via the PriusChat mobile app.
that's the inverter charging voltage, you want to read it with the car off, and after it has been off for a few hours to reduce surface charge.
So I checked the battery after sitting all night and it's at 12.6 v Posted via the PriusChat mobile app.
sounds okay. connections clean and tight? especially negative to body. after checking them, you can double check by measuring the voltage at the jump point under the hood.
I agree, your symptoms sound like bad 12v behaviour. Independent of the hybrid battery state. When the car is off, the HV battery is completely disconnected from the car. Physically disconnected by relays. So for it to lose radio presets and windows, that's a tell-tale sign of bad things happening on the 12v bus. If the battery is getting low because it is weak and old, then that explains it all. If there's a short somewhere intermittent, like rodent damage, then a new 12v battery won't help. There is usually a date code on the 12v battery. Might help to read it to know if it is original or not. If original, just replace it.
So upon further inspection, the ground bolt actually was on fully tightened but I went ahead and removed the battery to look at the date sticker but it has no sticker just a serial number and some other numbers that I can't decipher. What really puzzled me was that the compartment beneath the battery was filled with what appeared to be water. I have no idea how that would happen unless there's a leak in the hatch but I think I would have noticed that. I posted pictures of both the battery and the water, any ideas how to date the battery? Posted via the PriusChat mobile app.
Well it is a Yuasa which isn't imported into the USA much anymore as of about 2012/2013. So best case your battery is 4-5 years old. The date code is on the top. Like this: http://www.yuasabatteries.com/pdfs/NP_date_code.pdf
The water is leaking in from the passenger side top of the hatch area. There is a seam there that separates an allows water infiltration. Very common. In fact it can cause the hybrid battery to throw a code because it usually leaks along a connector by the hybrid battery fan and eventually corrodes until it fails.
Anywhere to cheaply get a new 12v battery? Advance auto sells them for almost $200 including core exchange.. Posted via the PriusChat mobile app.
