Thank you for the excellent, detailed instructions. I was able to replace my OEM battery without any problems. I do have a question related to charging the new battery. Your direction is: For optimal performance, calibrate your newly installed battery: Charge it to 100% and keep charging it for at least 2 more hours. Then use your device until it shuts off due to low battery. Finally, charge it uninterrupted to 100%. The instructions that IFIXIT sent with the kit was to allow it to run down to 10% then charge it to 100%. Is there a big difference here or are both methods okay?