A professional sales and R&D team is your great back up, any of your inquiry and questions will be replied in 24hours.Quality is our life, only 0.2% defective rate, make sure battery in good performance. Fit for A1278 MacBook Pro Battery Mid 2012,Late 2011,Early 2011,Mid2010,Mid 2009(Only for 13 inch Laptop)->See more specific models on the Product Description Brand new battery-> Directly warranty from Manufacturer, perform as good as the original battery.Around 1200 models batteries for you choosing, and at least 4 new battery models released monthly.OEM battery and original battery both are available.Focus on battery and power industry with over 10 years experience.And finished batteries must pass short-circuit testing, high temperature testing, aging testing, shaking and drop testing. Strict quality control, every batch cell must pass ourself cycle testing, charging and discharging testing, etc, then move to production line.100% aging testing before delivery to make sure battery is in good performance and with low power consumption IC design.Go back to a MacBook Air (mid-2009), however, and its battery maxed at 500 cycles.
Most of the modern computers of the last half-dozen years for example, a MacBook (Retina, 12-inch, 2017) or MacBook Pro (13-inch, M1, 2020) have a max of 1000 cycles. Made of brand new material, like Cell, PCB, IC, etc, refusing any second-hand and refurbished material. That depends on the device and the product generation.