[quote name='pokey9000;40728]Rule of thumb about replacing AC adapters: Voltage should match exactly' date=' tip size should match well enough to make reliable contact, current rating should be equal or greater than the original. This works for most normal barrel plug gadgets.[/QUOTE'] I have measured a number of 12V DC power supplies. Most of them provide more then 13V, some as much as 18+V. Don't take the word of the adapter (what it says on the case). Be sure to check the voltage so that you don't hit the battery, voltage-wise, too hard -and reduce it's life considerably.I took a large (in size) 12V (really 12V) 1A adapter, and soldered a tip (the full wire, not just the tip) to the circuit board of the adapter. It is working GREAT. In fact, even though it is rated at only 1A, I believe it is charging my PDN faster then the adapter that came with the PDN (rated at more then 1A).I also have a really great adapter from Radio Shack (no wise cracks) that is multi-voltage, multi-tip. It is right on with the voltage and is capable of about 2A. I don't have a tip that will fit (I need to go in and try to find one), but I suspect it would even heat the battery up a little high, because it could draw more amps from the adapter than the battery should safely be drawing. That can reduce the life of the battery, too.