On my three-year-old macbook the battery is dead, it lasts maybe half an hour. Replacement costs 350$ or so, ouch. Maybe the bigger question is whether the bett

On my three-year-old macbook the battery is dead, it lasts maybe half an hour. Replacement costs 350$ or so, ouch. Maybe the bigger question is whether the better can be replacement relatively cheaply, not whether it lasts 10 or 7 hours.