Hi there, I've got an Alienware 15 R2 that I bought 2 years ago. Everything worked fine until about 6 months ago when the battery began disconnecting and rapidly discharging (about 2hrs from full to shutdown) whenever I open any games.
I've searched everywhere for a solution. Diagnostics show battery health to be fine, I've tried different charging cables (mine is currently 240w and was the cable I received with the laptop) and I've attempted to reduce all processes to the bare minimum.
My fiance and I bought a matching pair of laptops and the other seems to work without issue. The only notable difference we've found was my BIOS having been updated recently while the other is an older version.
For those who care for an answer, after searching everywhere for answers and coming up empty I decided to open up the laptop (my warranty was finished anyway) and discovered that the DC in cable (power jack cable) had fried, possibly due to a surge.