Originally Posted by SDRebel
if that is the case, then it would be alright, but if it is not the case....then we don't really know
I have checked the stock battery cell that came with my PocketPRO. The Black wire is the the common or ground wire that everything is in reference to. The Red wire is the battery's output(or input for charging), which is about 4.2 volts fully charged and about 2.8 volts when fully discharged. The nominal voltage is 3.7 volts. The Yellow wire is the SBD (Smart Battery Data) signal, which has no data when the battery is disconnected from the device. The SBD signal is a bi-directional digital signal used to provide information about the battery to the PocketPRO microprocessor. Since the SBD signal is digital, you need an oscilloscope to see it properly, and you also need to understand the SBD protocol to know what the information on the SBD signal is. The SBD signal is the middle connection on the PocketPRO connector, so any replacement would also need all the connections in the the same order on the three wire connector.
The electrical properties of the PocketPRO battery cell are very similar to the newer Nokia BL-5C 1000 mah cells. The Nokia BL-5C is a Lithium Ion cell, but the PocketPRO uses a 1000 mah Lithium Polymer cell, so the form factor is very different. The Nokia BL-5C cell that I use in my Hanlin V3 is 5.5mm thick, but the cell in my PocketPRO is only 3.6mm thick. If a replacement cell is thicker than 3.5mm it will not be possible to get the PocketPRO battery cover to fit properly. IMHO, that 3.6mm thickness is going to be difficult to find in anything but another Lithium Polymer cell.