Not surprising anymore, but 4 days off charge without the AirPods being paired (just paired them now):

Really seems like something is happening after they're paired.
Curious about this too. Maybe by manually pairing the AirPods by pressing the button and going to iPhone - Bluetooth settings?
Just wanted to chime in and say that the battery drain for me also seems to be fixed by not opening and closing the case without using the AirPods. As long as I take out the AirPods and use them for a bit (not sure how long is required) then the battery case and AirPods seem to hold their charge....
Strange bug - but hopefully very fixable in a software update.
I'm only seeing < 2 hours call time with mine, at my desk, with the iPhone 7+ about two feet away (plugged in and charging). After each one-hour conference call, I'm usually at 47-49% so I charge them in the case before the next call
2 hours call time is the expected battery life of the AirPods.
Sorta funny that the problem wouldn't be a problem if I just never bothered checking the battery levels to see if there was a problem. Haha
    Date          Time              AirPods             Case                        Message
06/01/2017        15:25              100%              100%            (Start music playback. First full charge of AirPods and case)
06/01/2017        19:00              40%                98%            (Stop music playback, AirPods back in case)
06/01/2017        20:02              100%               89%
07/01/2017        01:00              100%               88%
07/01/2017        06:03              100%               80%
07/01/2017        08:51              100%               72%             (Start music playback, AirPods removed from case)
07/01/2017        11:28              58%            (Not Checked)       (Stop music playback, keep AirPods out of case)  
07/01/2017        13:56              50%            (Not Checked)       (Start music playback)
07/01/2017        15:36          13% L / 23% R          68%             (Stop music playback, AirPods back in case)
07/01/2017        16:26              100%               45%             (AirPods still in case)
07/01/2017        17:37              100%               45%             (Start music playback, AirPods removed from case)
07/01/2017        22:03              18%               38%             (Stop music playback, AirPods back in case)
08/01/2017        09:03             100%               18%          
08/01/2017        12:46              100%               17%             (Start music playback, AirPods removed from case)
08/01/2017        15:20              56%               (Not checked)          
08/01/2017        17:44              10%               15%             (Stop music playback, AirPods back in case.)
08/01/2017        21:22              100%               100%             (Second full charge of case and AirPods.)
09/01/2017        12:06              100%               99%             (AirPods still in case after second full charge)
09/01/2017        18:15              99%               83%             (Start music playback, AirPods removed from case)
09/01/2017        20:03              83%               81%             (Stop music playback, AirPods back in case)
11/01/2017        06:07              100%               63%             (Start podcast playback, AirPods removed from case)
11/01/2017        07:15              84%               63%             (Stop podcast playback, AirPods back in case)
11/01/2017        08:36              100%               48%             (Start music playback, AirPods removed from case)
11/01/2017        12:57              14%               48%             (Stop music playback, AirPods back in case)
11/01/2017        14:42              100%               27%             (AirPods still in case)
11/01/2017        16:09              100%               27%             (Start music playback, AirPods removed from case)Well, that didn't last. My AirPods performed awesome battery wise for the first couple days. Since then, I can only reliably get 2.5 hours from a single charge until they shut off. Also, my battery case is losing about 50% every 12 hours even when not using the AirPods.
I emailed Tim Cook's office because I wanted to know if the firmware was indeed update-able. I knew that the genius bar or Apple support wouldn't know that so I went right to the top to get that question answered. I was completely happy waiting until there was a firmware update if that was possible - I just wanted to know so I could make an educated decision.
Executive relations got in contact with me. The engineers wanted my AirPods for testing so we've arranged a switch for new ones next Wednesday. I'm very interested to see what the next pair does battery-wise.
I tried doing the previously suggested trick, where if you open the case, you have to actually take the AirPods out or else the battery will drain - but that didn't help. I'm still losing at least 1% per hour when they're not in use.
Not surprising anymore, but 4 days off charge without the AirPods being paired (just paired them now):

Really seems like something is happening after they're paired.
AirPods and case were at 90% before I left on Sunday. I left them home on a trip (Wednesday night). Just got back and:
AirPods: 100%
Case: 60%
At least we found the problem. Sorta funny that the problem wouldn't be a problem if I just never bothered checking the battery levels to see if there was a problem. Haha
But it's night and day difference. When I was checking, after three days I got about 4-5 hours use total before it was dead. I'm almost at 5 days now with about 8 hours use and still have 50% charge.
And it didn't seem to matter how often you open/close case without removing AirPods to use. Do it once, and it would drain slowly until you removed them to actually use them.
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2 hours call time is the expected battery life of the AirPods.