Oiy, this is getting annoying. My battery health has been upwards of 99%, then has inconsistently fluctuated 4%-5% and until last night, was holding steady around 95%. So I let the MBA sleep over night for 12 hours while unplugged and the battery health dropped 3% from 95%->92%. What the heck!
Also, I know the battery discharges a little bit over sleep, and I calculated in about 12 hours it dropped 400 mAh, that's about 33 mAh an hour. Can anyone test to see what they get?