I managed to get my hands on a Parasoll sensor that has shown the battery drain issue. Will include it in my Zigbee network physically next to my sensor that has not shown the drain issue with both a fresh pair of Ladda batteries and report back here in a few weeks.
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Interested to see what your results will be!
Fix!
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Great find. So it might be a hardware issue after all 
This would reflect my earlier comments around the battery being drained to 0.8v or less if you donât jump on replacing them straight away when they go offline. Seems the hardware isnât happy and keeps drawing power.
Wonder if you can get a cap in the factory package?
Awesome research, thanks! Disappointing firmware wonât be able to fix this one.It would be good to highlight this to Ikea somehow. In the UK they only have phone and in-person support⌠no email.
I have 6 installed, and have had good luck with Ikeaâs return policy. Hopefully there is a v2 hardware revision that fixes this issue, as the form factor, price, use of AAA, and accuracy when it works makes it one-of-a-kind in the market (havenât found a good replacement, if you donât mind it being double the size this ones okay - make sure you buy the Zigbee one, not Wi-Fi 
)
Wow, nice find. So, this means we could fix this in hardware right.
Could you tell me how to connect it correctly and what the minimum capacity should be? The image is a bit blurry/to zoomed out to see.
Also, what is the best way to open it up? Your casing seems mostly intact.
Thanks!
Edit:
found one of your comments on your YT videoâs: ââŚI just added a 10uF capacitor across VCC and GNDâŚâ
Now to open one up without damaging the casing to much. 
Edit2:
Managed to open it. It seems to be glued somehow, all along the edge. Did manage to open one up without that much damage.
Added a 10uF capacitor and closed it again. Still works, woohoo 
So it does fit. (with small force), could be resolved my removing just a tiny bit of the inner casing or choosing a different path for the GND wiring.
Might have a small SMD capacitor somewhere⌠not sure what to minimum capacity should be?
Now wait and see how the battery will perform.
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If possible / available, share some photos!!! I think people would want to see how exactly it is done, with some visual assistance & closed-up photos
Further to add to being perplexed⌠I moved the back door parasoll right next to my Pi with the Zigbee stick - and itâs battery has been 100% for weeks now. Previously it was eating a battery per two weeks. Back door gets triggered ten times a day. Iâm off to the electronics store for some caps anyway.
where did you fit the cap?
GND (battery leg connector) <> VCC
Used kapton tape to make sure it does not short anything.
Extended the cap leg with a black wire (which is low quality as it melted somewhat as you can see 
)
I do have way smaller capacitors which could fit right on top. But I do not have the equipment to measure if the solution is working with like 1/10 of the that capacity. So figured, first try with the exact same setup.
I might try and contact GNIF (Video owner) to know what to do.
The door next to my HA setup (POE Zigbee) like 40cm away, empties out the fastest (opens maybe 50 times a day).
I have some 10uF ceramic capacitors, those might be less of a tight fit.
