That (and your other answers) was very very helpful. Thanks!!
I am about to source the diode to attempt replacing it but … the GS1010 comes in sod123 and the diode on the Xiao s3 is sod882.
I am totally new to surface mount soldering it seems they are not compatible. Am I right?
Nexperia seems to have sod882 low leakage current diodes, but they are only rated for 200mA.
I selected GS1010 because LoRa-E5 I replaced used relatively large component, but it is certainly too big for ESP32S3_XIAO.
You have seen the internal picture of the C3, but it is made with a larger land, so that larger diode can be mounted. I don’t know what S3 is like, but I think it would be better to look at the inside of S3 before selecting components, larger components may be able to be mounted there than in SOD882.
For SOD882, CTS05F40 might work.
Superb post, Informative and helpful!
I still need to replace the diode and see if/how the power consumption improves but I must say that the Nordic PPK2 isn’t as great as I thought for measuring power consumption.
Sure, it is one order of magnitude cheaper than the next option but it turns out that the measurements are all over the place between PPK2 versions. In my particular use case, some versions measure 600uA and some others (e.g. the latest one right now) measures around 200uA (which is what I expected). Let’s hope it was a temporary bug.
I believe I upgraded the PPK2 version while doing this tests so I am not sure anymore whether the soldering was really the culprit.
Also, it currently resets after a few hours in Mac/linux, so I can’t do long terms measurements :S . I will stick with it for now though since I don’t want to spend $700 in the next best option.
BTW @msfujino , have you tried using UV PCB glue to secure and insulate the battery wires?
It has given me such a headache that I am considering to use it instead of hot glue. It should have a smaller footprint and should insulate the pins better, shouldn’t it?
I have read elsewhere that people use “pogo pins” too but my projects involve existing boards and I am not sure how to attach them.
Hi there,
So I built my custom board and attach the Xiao with oval holes on bottom of PCB for easy solder connection, 100% success rate, check out the thread 
Soldering of BAT and Thermal pads on ESP32-C3 to a motherboard - #6 by PJ_Glasso
HTH
GL PJ
have you tried using UV PCB glue to secure and insulate the battery wires?
The photo in Post 13 is fixed with urethane resin adhesive.