it's hardware. The only thing you can do yourself (but it IS rather expensive) is to try a new battery. If it's not that, back to Dell.
If the battery is OK (you've got 2 then), and you don't like the repair scenario, see if you can buy another charger. Either a full Dell XPS (rather expensive also, you now have got 2 laptops and 3 batteries) or something like http://accessories.us.dell.com/sna/products/Power/productdetail.aspx?c=us&l=en&s=biz&cs=555&sku=A1214550 but than for YOUR type of laptop battery (this particular one is for some Inspirons and Latitudes).
I posted this problem in Dell Forum but got no response. Maybe some of you have idea on what steps I should take to eliminate this issue.
The notebook is
Dell XPS 13 Intel Core 2 Duo P8600
4GB DDR3 memory
Ok, forget about warranty because I bought it in US and it said that if I bring it outside US, the warranty is voided. I use it in other country.
The laptop if working fine and fast when it's either on battery OR if connected to adapter only (without battery). BUT when I plug both battery and adapter (basically using it while charging), after 30-60 seconds, it will act like in slow motion. It's really obvious especially when I switch between windows or opening a folder. It's like some huge process is going on in the background. BUT when I check the task manager, the CPU is not busy at all. I tried system restore, even clean install my Vista 64 with no help at all.
So, now I only use it without battery and this one becomes desktop replacement sittin on my desk.
Anyone has any idea on what I should check?