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@n3lson  Dell has been used the same 19.5 V output to the same 7.4mm barrel style connectors on their power supplies for over 15 years now, and they've had 130W versions of those power supplies from the beginning.  There are bound to be different part numbers based on different suppliers and even some design changes Dell has made, such as slimming down the brick, adding a blue ring on the dock/system connector side to indicate that the adapter is receiving wall power, etc.  It doesn't necessarily mean that the older power supplies were less reliable.  There's just a huge inventory of these supplies out there.  For what it's worth, I used an 2008-era 130W power source for about 8 years, including with much newer systems, and it worked flawlessly with all of them.