A colleague has given me two Motorola GSM phones, a d460 and an International 8700. According to timestamps on the battery packs, they were used in 1998-2001.
All three battery packs had no output, of course, but helpful + and - signs mark where energy would enter the mobile phone. This allowed me to use an external power supply and confirm the devices work.
Why not trying to recharge their battery packs? These "MicroTAC" battery packs have connections both on the inner side, to the phone, and on the outer side, to the desk charger. I probed around with the multimeter and found the common ground between front and back.
With nothing to loose I set the power supply to 7.2V and started probing around: soon enough the Li-ion battery pack started taking current. What's even better is that it keeps the charge and powers the mobile phone!
For future reference, here is the incomplete pinout for Motorola MicroTAC SNN batteries:
 |
| Motorola MicroTAC battery pinout |
The pinout depicted in the picture above should apply to these models:
SNN 4027
SNN 4058
SNN 4102
SNN 4132
SNN 4239
SNN 4259
SNN 4263
SNN 4283
SNN 4310
SNN 4314
SNN 4340
SNN 4346
SNN 4383
SNN 4458
SNN 4467
SNN 4612
SNN 4836
As usual, fiddle with these batteries at your own complete risk, even if you know what you are doing.
