You recently purchased a new battery for your Dell Inspiron 1501 laptop computer system. Before your old laptop battery died, you received this message before a Microsoft Windows operating system logo displayed on your laptop screen. "The AC adapter type cannot be determined. This will prevent optimal system performance.
Please check AC adapter connection properly, remove AC adapter and plug it in again". You just started receiving that error message with your new Dell Inspiron laptop battery. Is something else wrong with your computer system you ask?
There is a known issue with some of Dell active current direct current power adapters when a little metal pin gets bent or broken and that laptop computer system can no longer identify that power adapter. If you can verify that that pin is bent or broken, then that would cause that error message to display and as long as it charges your battery and works then you can actually ignore that error message. If you cannot verify that there is a bent or broken pin, it might be caused by some Dell software or a faulty active current direct current power adapter.
You can remove some Dell Quickset computer software program and see if after rebooting your computer that error message disappears. It could be that that computer software program indicator is wrong or that there is actually a bent or broken pin on your active current direct current power adapter. You could test your Dell power adapter with a voltage meter or take it into a computer repair shop to have it properly tested.