4 ms·The $200 Acer model is the one with the low battery life, in large part because it has an HDD.by justinschuh 14y agoThe $200 Acer model is the one with the low battery life, in large part because it has an HDD.ecspike 14y agoYou can also upgrade the Acer to a SSD and you might be able to upgrade its RAM.mtgx 14y agoAnd its Celeron chip.