Owner Eric Burnett says he didn't find out the batteries were missing until he pulled one boat in to make repairs.
"In broad daylight, I had a thief come out here and steal five of my customer's boat batteries," said Burnett.
Security cameras posted around Burnett's business are what is giving him peace of mind.
"Well I was pretty angry and even more nervous having to call customers and tell them, 'I have to go buy you a new battery.' That's not something you want to call a customer and tell them," added Burnett.
Since Monday, investigators have been watching, and re-watching, security video from the shop trying to figure out who their suspect is.
"Looks like he has some tattoos maybe on his right arm," said Captain Jeff McCarter with Sevier County Sheriff's Office.
Investigators say it took less than five minutes to snatch five batteries, each one costing between $100 to $120.
"They didn't get much it just cost me more money than what they made," said Burnett.
Right now, investigators think they know what the suspect is doing with the items.
"They're generally sold at a scrap metal dealer," said Captain McCarter. "I hope that someone might recognize the person or the vehicle and help us solve the crime."
In the meantime, Burnett is locking away what he can so that something like this doesn't happen again.
"It's a little bit more of a job carrying heavy batteries out of the boat all the way into the shop and stuff. But if I've got to do it, that's what I've got to do," said Burnett.
Detectives with the sheriff's office believe their suspect may not have been alone, they say it looks like there were at least two other people in the car during the theft.
The suspect is described as a white man with a tattoo on his right arm, he was wearing a blue shirt, dark pants and a ball cap. He was driving a light colored Chevrolet Cavalier. If you have any information call investigators at (865) 428-1899.