The pin isn't the issue.  OEM adapters have a chip onboard that communicates with a counterpart on the Dell system board.   SOME non-OEM adapters (but in fact, very few) will properly communicate with the system board.  Most will not. You need an OEM adapter to be guaranteed the ability to charge the battery.  
1 month ago my AC adapter was stolen (this is important info) I live in the Canary Islands, off the coast of Africa.  It is not possible to have a Dell AC adapter shipped to me for less than $100.  I have called every single place on two of the 7 islands. It cannot be done. Therefore, I was forced to buy an off-brand charger that SHOULD be compatible (meets all the specs) Of course, as you know, and as I have learned (if you don't know then please don't bother replying) that non-Dell AC adapter will not work because the center pin does not make adequate contact. Remember the original AC adapter was stolen. That means the AC adapter is not broken, the AC jack is not broken, and the motherboard is FINE. Everything worked just fine until the AC adapter was stolen.  The computer holds a charge when the new AC adapter is connected, but the battery will not charge (again this is because that center pin in the new AC adapter does not make adequate contact) and the machine runs slowly. I intend to replace the Dell AC jack (input) with a non-Dell AC jack (input) hoping that the new AC jack will allow the center pin to make contact and thus allow the battery to charge.   My question is this: Do you think/know that this will work? Secondary question: Do you know a way to prevent the slowing of the machine that occurs as a result of having an unrecognized charger connected (I could like with all this until I can make it back to the states to buy a Dell charger, if I could get the machine to run normally)?
15 R2, replacing AC jack to accept non-Dell 240W AC adapter?