I have a 2001 Tundra V8 4wd LTD, and I'm still using the original factory battery. Other than some leaking a few years ago, it's been reliable, and still cranks good. Since it's 5 years old, I decided to be proactive and went to the dealership to get an identical replacement battery. My original battery was made by GNB, and is rated at 582 cca/ 125 rc, group 24R.
The new battery is a Toyota brand (True Start or True Guard, can't remember), 575 cca/130 rc, group 24F. Still has the caps to check the acid levels. I bought the new one, since the service guy gave a me a good deal on it, and said it should be a direct replacement. I just wanted to be sure that the new battery will be compatible with our electrical system. Are 24R and 24F batteries interchangeable? Thanks!