I think the adapter I got on eBay for my Latitude D610 is a fake. It weighs half what the stock ones do. I've read about identifying fakes, regarding label differences (I don't see any spelling errors; hard to tell for the German text!). However, a couple of articles I read said that the fakes either don't work or don't charge the battery. Unlike a previous one I bought, this one didn't generate any error messages on startup, and it does charge the battery & has been working OK for a week or so since I got it. I've run it for hours & I'm not sure it gets any hotter than the old one. Of course the biggest thing is the weight difference, but as long as it works, & I don't generally leave it plugged in or running unattended, I figure it's OK to have as a backup... I haven't tested the voltage yet but could do that. It's (supposed to be) a 90W PA-10.
Any advice -- is it safe to use, do you think?