2004 Jeep Grand Cherokee Limited 8 Cyl 4.7L
I was told my battery is corroded. Isn't that normal?
Someone wants to charge me money to fix
You can easily repair this yourself - using an old toothbrush, and some household baking soda. First step, remove the battery negative and positive terminals. Next, mix a paste of baking soda and water, then using an old toothbrush clean off all traces of the corrosion from both battery terminals. Clean / rinse with fresh tap water.