- I assume *NO* responsability

(Numbered up to down, battery left, keypad right)
   Contact Pin N°    Use                                  Direction from phone
------------------------------------------------------------------------------
 B  B  -  T  S   1   Audio Ground                         in/out
 o  a  -  o  c   2   Ext V+ (power supply and charger)    in
 t  t  -  p  r   3   True data (TD)                       in
 t  t  -     e   4   Downlink - Complementary data (CD)   in
 o  e  -  o  e   5   Uplink - Return data (RD)            out
 n  r  -  f  n   6   Logic GND                            in/out
    y  -         7   Audio Out - on/off                   out
 o     -  p  &   8   Audio In                             in
 f  s  -  h      9   Manual Test - ???                    in?
    i  -  o  K  10   Battery Feedback                     in?
 P  d     n  e
 h  e (o) e  y  11   Antenna connector                    in/out

Note:
To enable battery charging connect 3KOhm from pin 9 to Logic GND and enter from
pin 2 with 7-9 Volt. Telephone have current/temperature/time charging limiter inside.
To enable "setup accessories" menu connect 56KOhm from pin 4 and logic GND.
To switch to the external antenna, a 2k2 resitor should be placed in the coaxial
antenna cable from shield to core. Usually a little pcb with smd resitor is used
between the two ends of a cut coax wire.
 

Battery contact
---------------

1 neg (-)
2 thermo (ntc to neg)
3 pos (+)
4 size (big batteries have terminal 3 and 4 shorted)

NTC values:
40 degrees celsius  6K
20 degrees celsius 10K
10 degrees celsius 15K
 0 degrees celsius 25K

P.S.:"Something more because litio battery have a complicated flexible board
inside, probably with permanent counter of # charge/discharge cycles"