Hi there
First time on this forum. I bought a LB100 with GPS from lightnspace. The LB100 works but the GPS doesn't.
I opened it up to find that on one side of the unit there is a very small battery. I tested it with my multimeter and it showed a voltage of about 0.19v. I pulled the battery off the board using a fine blade and I can see the battery is a MS621FE, which according to my google searches to possibly a Seiko 5.5AH 3v battery. The battery is spot welded and does not seem to be an easy to replace item. My google searches also seem to show that the battery is rechargeable, so I tried charging it for about 2 days straight. The most the voltage got up to was 1.2v but it unexplainably dropped to 0.5v. Each time I tested the GPS unit, it did not work.
So it is quite possible the faulty GPS units are being shipped with dud batteries.
Now if only Kevin from lightnspace would return my emails...