ive an air2 that my wife gave me in sept of 2015. Lately it’s only lasting a day and just last night I went to sleep with it around 30% and it was dead this morning. I checked the health with coconut battery and it said I’ve lost about 12% in capacity but another app is claiming a 20% loss. Is it worth it to pay Apple $100 to replace the battery or should I think about upgrading to a pro. Other than battery life I’m still very happy with my air2 and don’t really feel like it’s old or slow at all. Opinions?