Originally Posted by klwagoner

I replaced my Lexus battery a few months ago. I was looking under the hood, maybe checking fluids (can't remember now) and I saw one of my battery terminals was COVERED in corrosion. I've never seen one that bad. So while trying to remove the cable, we pulled the post out of the battery -- that's how corroded it was (even after doing the baking soda/water thing). At that point there was nothing to do except buy a new battery. The odd thing, to me, is that I've had the Lexus almost two years and it has never not started or even hesitated to start. Just lucky, I guess.

Originally Posted by lex_rx

^ What, you didn't perform an engine wash for two years?:-)

It's almost spring cleaning time again.

Originally Posted by FLYCT

At 12.11v your battery is only at a 50% State of Charge.

You either have a weak battery or you have something discharging your battery overnight due to a high parasitic drain.

Once again, anything over 50 ma or so is suspect.

Here's a good YouTube video with explanation and troubleshooting info

How To Perform a Parasitic Draw Test - EricTheCarGuy - YouTube

Good luck.

Originally Posted by ericsan13

I tested again this weekend and let the computer go to sleep. Luckily it turns out I have no parasitic drain as the current drops to 20ma after 2 minutes. It's probably an issue with the battery.

Originally Posted by lex_rx

^ What, you didn't perform an engine wash for two years?:-)

It's almost spring cleaning time again.