Untested as I don’t have C batteries, but there’s no corrosion whatsoever as shown and worked the last time tested years ago.

Any questions please don’t hesitate to ask. Please check out my other items and feedback. Buy with confidence! I have a bunch of other old vintage Star Wars collectibles figures, cards, memorabilia ect so if you’re interested in those check my store regularly for some more new items. We are liquidating a time capsule into the 70s and 80s of Star Wars goodies! Every item was from the original owner! Thank you so much for looking!