Samsung S7275 battery pins layout? To power with powersupply.

[chihwah li]

Hello all,

I am trying to figure out how to connect a linear powersupply onto my Samsung S7275R phone.
The battery of the type B105BE has 4 pins, as follows: A,B,C,D

A is unknows
B is minus connector battery
C is unknown
D is plus connector battery

What I did so far.
I connector a lab powersupply with a voltage of 3.8V onto the plus and minus of the phone. Then I power up the phone.
The phone boots, but shuts down.

I tried connecting a resistor between C and B with the values 10K,330 ohm, 2,2K, but the phone starts to boot, I see the samsung screen, then it powers down again.

There is no difference between both my attemps.

What Am I doing wrong? How is the battery thermistor connected to the pins? What value should I use?

( For my S6312 Samsung phone I successfully connected it to a powersupply, but the S6312 has only 3 pins.)

Help?!

 

[chihwah li]

I guess one pin is for battery identification (BID) and the other has a thermistor connected.
http://shaddack.twibright.com/projects/hw_nokiabat/

For the thermistor I tried 10K ohm.
For the BID I tried 47K
as mentioned in the link: http://electronics.stackexchange.co...es-this-mobile-phone-battery-have-4-terminals

But so far it only starts shortly and shutsdown quickly.

 

[KrisBlueNZ]

I wouldn't assume that there are only passive components in there. Probably the best way to find out would be to take one apart.