I returned my 17 i7 MBP for a 15 i7, I have been torn between the 2. My question is the 15 battery seems to drain alot while sleeping. last night I was around maybe 40% and went to bed and now its 0%. coconut battery says 100% health. The 17 did not drain that much over night. I will check it out tonight just to make sure I was right re the charge before bed. I calibrated it last week. Any thoughts? both 15 and 17 should get the same battery time?