The battery of my MacBook Air (13-inch, Mid 2013) that I bought last 2013 has been draining fast that I felt the need to replace it. So I contacted a local Mac repair guy and he said he would be able to replace it with a brand new battery from what he claims to be the same manufacturer's. I checked the battery specs and it seems legit. Manufacturer and Serial numbers seem to be ok. Cycle when I got this = 0. Problem: Accdg to specs a new MacBook Air 13-in mid 2013 should have 12 hours of battery life. That's at a rate of 100%/12 = 8.3% drain per hour. But when I measured my battery it's draining at a rate of 22%/hour! Battery age, accdg to Battery Health App, is 2.2 years. On one hand this could be reasonable since it was manufactured 2.2 years ago but not used, hence cycle = 0. Or did I get a lemon? Thanks. See specs below Battery Information: Serial Number: D8620920854DKRNAG Manufacturer: SMP Device Name: bq20z45 Pack Lot Code: 0 PCB Lot Code: 0 Firmware Version: 406 Hardware Revision: 000a Cell Revision: 162 Charge Information: Charge Remaining (mAh): 4138 Fully Charged: No Charging: No Full Charge Capacity (mAh): 6374 Health Information: Cycle Count: 8 Condition: Normal Battery Installed: Yes Amperage (mA): -971 Voltage (mV): 7765 Please note that cycle count = 8 because I have made 8 recharges since I got this replacement.