Each year for the past 5 years we back our student devices during the December holidays and completely re-image them. We find this gives them a new lease of life, we can pick up unreported damage, fix screen cracks etc and get damage repaired and addressed during the holidays.
Devices Last Longer: Recalling them over the holidays ensure that the Macbooks get about 7 weeks of rest, which over three years is 21 weeks / 4 weeks = 4.25 months of additional battery life and reduced rick of damage.