18 of the XK-10 MacBook Chargers are dispursed to the lending libraries at UCLA under the College Library Instructional Computing Commons (CLICC) program. MacBooks are lent out for 4 hours and returned with a drained battery. 18 x 10 bays x 16 hours a day x .70 occupancy x 7 days = 14,112 battery charges per week. Below is a picture of 5 Chargers in the Powell library. Note, the batteries waiting to be charged in the right corner.