It may not look any different from the outside, but Panasonic has made some not insignificant upgrades to its rugged, 12.1-inch ToughBook C1 convertible tablet. That starts off with a new Intel Core i5-2520M vPro processor (2.5GHz, Turbo Boost-able to 3.2GHz), along with a standard 320GB 7,200 rpm hard drive (up from 250GB before), and some improved battery life — Panasonic says you can expect twelve hours from a pair of hot-swappable batteries, or six hours with one. It also says its various improvements contribute to a start-up time that’s 30 percent faster than the previous model, although that will obviously vary in real world use. Somewhat unfortunately, the convertible’s base price tag has also seen a slight upgrade — it’ll now start at $2,599 instead of $2,499 when the new model rolls out next month