PD170 Internal Battery Part No.'s Inside
 

These will most likely apply to the PD150 also.

I took the plunge and $40.00 later from Texas came the batteries.

I was able to disassemble it so not to need to disconnect any ribbons (got creative) and with a good soldering iron replaced them with success.

I was good at staging the external battery so I could swap it out fast and not loose settings. Well the last time I did it it failed and the swap was very fast.

Attached is a pic of the box if you guys need to find them. The P/N is under the Bar Code.

Re: PD170 Internal Battery Part No.'s Inside
 

Good info. Where did you buy the batteries? Was it an Ebay thing? Also, was there a site that showed how to do the disassembly?