Originally Posted by Cadd

I don't have any aftermarket stereo system or any other electrical devices in the car. So basically, I can't go wrong with Interstate or a Sears brand right?

I'll just try to get something the same size as the OEM battery with a high CCA number right?

Originally Posted by LexusPia

Here's an update on my battery. It started to lose charge and by Friday morning it was down to half despite I had it charged up Thursday evening so I knew it was time to get a new one. Called Lexus dealer Friday and they told me that the battery group size is 24 for both GS4 and GS3 and the original battery is rated 575CCA. They carried a replacement battery made by Interstate for $90 plus installation with 2 yr full replacement however that battery had been on the shelf for awhile. I called Sears and they wanted $80 plus $10 installation on their Diehard Gold but didn't have a group 24 with the positive terminal on the right. I went to Sams Club and they had a huge supply of fresh batteries (shipped Dec 04 and Jan 05). For the group 24 size, they carry one for $39 installed with 2-yr full replacement and another for $57 installed with 3-yr replacement. I wanted the 3-yr but because it also comes with optional side connection, the side terminals interfered with the Lexus battery cover. The 2-yr battery was the only one that would fit inside the battery cover since it doesn't have side terminals. It is rated 685CCA and it starts my car up great now. Not bad for only $39!