This 13-inch MacBook Pro (model MB990LL/A) also now includes Apple's innovative built-in notebook battery for up to 7 hours of wireless productivity on a single charge without adding thickness, weight or cost. Using Adaptive Charging and advanced chemistry first introduced with the 17-inch MacBook Pro the built-in battery delivers up to 1000 recharges before it reaches 80 percent of its original capacity--nearly three times the lifespan of conventional batteries.