the recharged them with coconut water. the professor made them all sit and stir.. don't you remember that episode.. they filmed that show by my house.. in echo park. it looks like the island still.

The Professor kept recharging the batteries that they had.

The Energizer Bunny was a regular guest on those shows.

They actually lived in california 8-) Other than that, acid battery could have been made.

Gilligan, and the Skipper too, Mr. & Mrs. Howell, the movie star, the professor and Maryann....those folks. Where did they come up with all the batteries for the radio they listened to, non stop.