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Bluetooth earbuds pinout help.

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ktulu:
Hi.
I have a Philips TAT2206 earbud.
I'd like to charge it without the charging case, (which I don't have) and without taking it apart.
It has 2 small holes at the end, but I cannot figure out which is which.
Does somebody have this or a similar model, and can help me out by measureing the 2 pogo pins inside the charger?
I have tried applying 4-5V trough a 470 ohm resistor. It took around 8-10mA in one direction, and nothing in the other.
Trough a 100 Ohm resistor it was 30mA, and when reversed the leads was 10mA but only while turned on.
For a second I even tried connecting it directly, but the consumption jumped up to 80-90mA.
I have to mention that the earbud is working. 70% charge left. (and was not rising even if I held the "charging" leads for several minutes)
Thank you.

tom66:
For such an inexpensive and compact device it's reasonable to assume that the charging is done at 3.7V - 4.2V directly; in other words, the charging case handles the charging. So you would need a Li-Ion charger, you cannot use a voltage source and resistor.  For such a small cell the chance of anything catastrophic happening is small, but the number one reason these types of earbuds fail is failure of the cell. 20-30mAh is pretty much typical for a cheaper earpod battery, which implies charging currents of around 20mA.  I suspect based on your measurements you were in fact charging the battery, but you will need patience to see if this works.

By the way, these small earpods are such an awful contributor to e-waste.  With a typical life of 3 years and being essentially unrecyclable at end of life, I really wish they were never invented.  (https://ig.ft.com/fixing-my-broken-wireless-earbuds/)

ktulu:
Eventually I managed to charge it up.
It was the "other way around"
Only takes like 15-20mA at 5V, and has built in LiIon charging circuitry. The current drops after fully charged to 0. A couple of hours.
Connections are, looking from the shaft-end with the earpiece facing down:
left hole: -
right hole: +
middle-down tiny hole is the microphone.

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