SDS100's are ticking time bombs as it's internal working temperature are so high and then cools down when turned off. The connector with the issue connects one circuit board directly to the next without any flex built into the design. The connectors will move when heated up and stress the solderings. I haven't heard of any SDS100 user that had the problem from day one. It always turns up later when enough stress have been put to the connectors.
I run my SDS100 from 5volt without its battery and I can feel that the battery compartment gets real hot. Heat are batteries worst enemy so there is no surprise that Unidens batteries sometimes have a short life span.
/Ubbe
Do I OWN a magic scanner then? June 2018 purchase with thin battery, received the thicker battery free of charge, I charge the batteries nightly in my scanner, I use the stock antenna, it goes outside with me in all different temperature ranges, has been on trips so doesn't just sit in one place, and the ONLY thing I can report is a broken battery clip, which was easily replaced. Unless you recently purchased one, you were never an owner but a "bench tester of a friends SDS100" is that still true?