Review on Upgrade Your Apple MacBook Pro Retina 13" With NinjaBatt A1502 A1582 Battery - Long Lasting [71.8Wh/11.43V] by Donny Collins

Replaced battery in MBA, worked well first 6 mos. Off charger life degraded quickly to less than an hour, eventually after 12mos to less than 10 minutes.Replaced battery in MBPr - Essentially the same results. Unfortunately I replaced the MBPr battery about 3 mos after the successful effort on the MBA. Gave these folks the opportunity to support the product before I wrote this review, that was 3 weeks ago now, with no reply. So, I say Don't Buy! It's a fair amount of delicate work to replace the batteries especially in the MBPr to be careful and not damage any surrounding circuitry.