12V battery at 10.35V reading from my multi-meter
 

My HS250h took a couple of times to turn on this week (ready light doesn't come on until i hit the button a couple of times). it only happen in the morning when the car is cold.
So I used my multi-meter to check against the battery and the reading is 10.35V when the car is off. It ranges from 9.89V to 14V during crank and remains above 14.xx V once the car is on.

Is my battery slowly dying and should it be replaced? I am not sure if these gem type battery has a different standstill voltage vs regular car's 12V battery.

I noticed some of you have already changed your batteries. It may be time since it is 8 years now.

https://www.clublexus.com/forums/hs-...tery-dead.html

Probably not worth playing around - just get a new one. Otherwise, you'll end up with a dead battery, and Murphy's law says it will happen at the worst time / place.

Sounds good. i will start removing the old one out and getting it replaced.

Went to Crown Lexus in Ontario, CA to pick up a new battery. Here are the pictures for this installation.


https://cimg2.ibsrv.net/gimg/www.clu...fd68f3ed9.jpeg




10mm socket is all you need.
https://cimg0.ibsrv.net/gimg/www.clu...0d2be2179.jpeg
open the right vinyl cover to access the 12V battery.
https://cimg1.ibsrv.net/gimg/www.clu...8d18d17b7.jpeg
Remove negative/positive terminals and vent hose from the battery. Remove the clamp to remove the battery.
https://cimg7.ibsrv.net/gimg/www.clu...81fc2820a.jpeg
Low voltage for this one

https://cimg9.ibsrv.net/gimg/www.clu...401497014.jpeg
New battery from the dealer. Like the packaging here.https://cimg5.ibsrv.net/gimg/www.clu...b4b4ababd.jpeg


The new one looks good with the voltage.
https://cimg6.ibsrv.net/gimg/www.clu...4657b89e0.jpeg
New Panasonic battery here.
https://cimg9.ibsrv.net/gimg/www.clu...48e4abfb8.jpeg
Replace the battery and place everything back.
https://cimg7.ibsrv.net/gimg/www.clu...073d65150.jpeg
The car will reload the system upon starting the car. Had to restart the car after this process is complete.