First of all thanks for this splendid forum and the insights we get on Mac on this... I had been a life long Windows user ( close to 15 yrs) when I shifted to Mac this January. I purchased a white unibody polycarbonate macbook. To admit , I immediately fell in love with the machine , the speed , the smoothness really got to me..But of late I am having worries over my battery Till one week back my battery charge cycle count was 25 with battery health as 100 % .. I was using the macbook in a pretty normal way i.e. keeping it in AC mains most of the time and discharging it some time upto 70 - 80 %. I went for caliberation as per the instructions given in apple support site and to my dismay after the caliberation the battery health fell to 94 % and now its to 91 % with charge count as 27... Is something wrong with my macbook or the battery ? I am posting the snapshot of the charge information. Charge Information: Charge remaining (mAh): 4938 Fully charged: Yes Charging: No Full charge capacity (mAh): 4963 Health Information: Cycle count: 27 Condition: Normal Battery Installed: Yes Amperage (mA): -153 Voltage (mV): 12464 To start with the FCC used to be close to 5400mAh and now its down to 4963 . This way I am worried that the 300 cycles and 80 % battery health might come way too fast... Please help me in understanding this erratic behaviour of battery.... I am using iStatPro to check up the battery health along system profiler Furthermore the default warranty is for 1 yr which I guess means that if the battery FCC drops to less than 80 % before 300 cycles in 1 yr then Apple would replace the battery free of cost.. If I take apple extended care for 3 yrs then will this battery coverage extend to 3 yrs ??