Rank: Wiz
Rating: 84%, 54 votes
The T is the thermister that the battery charger uses to determine the battery temperature and make sure it's not being damaged by high temperatures, you can safely ignore it when you hook up an external supply, it won't cause any errors on the camera or anything.
If you want to hook up a DC adapter to your camera just make sure it's a well regulated (a switching power supply should be just fine, like a wall adapter only they're typically much lighter weight but adapt AC to DC) and is the correct voltage. The reason I recommend a switching power supply is that traditional wall transformers only provide the rated voltage at rated load, meaning if you hook up a 12VDC 2A wall adapter to something that draws 1/2A it will have a significantly higher voltage that it has stamped on its case.
Happy Hacking!
