Blame dead batteries and a faulty warning system for leaving the KU campus without Internet or e-mail service for most of a day last week.

A team of experts identified the problem and made other changes designed to prevent the Internet outage — dubbed by some in the Twitterverse as “Apocalypse2010” — from happening again.

“The system is fixed,” said Jack Martin, a KU spokesman, estimating the cost of work at $13,000. “New batteries are installed. We are back up and running on regular power.”

Internet service and KU e-mail accounts had stopped Thursday, when a massive surge protector — designed to protect more than $8 million in computer servers and other equipment — had tripped.

The system had been designed to transfer power to backup batteries or a backup generator, he said, but neither contingency occurred.

“The batteries had not been charging, and as a result were dead,” Martin said. “The system had not been telling us that they were dead, like it was supposed to.

“When there was a momentary power fluctuation, there were no batteries that could keep the system going.”