I have an XPS13 that I wanted to get a spare power adapter for. I purchased a used genuine Dell JT9DM on eBay. Same model number as the original adapter. If I plug the new adapter into the laptop and into the wall it charges the laptop. If I remove the power connector from the laptop the green light on the power adapter goes out and will not turn back on unless you unplug it from the wall and then plug it back in. The power adapter that came with the laptop does not do this, the green light stays on regardless of being connected to the laptop.
I figured the adapter I got on eBay was defective and purchased another. It does the exact same thing. So while I can charge the laptop battery with the two adapters, I have to unplug them from the wall every time I connect the adapter back into the laptop. Is there some way to re-program the adapter to stay on all the time?