|You need to stick a single post. Maybe if you did that & answered the followup questions you've been asked, your problem would be fixed by now.|
1 - WHY do you need to reset the BIOS?
2 - what is the make/model of your motherboard? Or if you have a brand name system (Dell, Gateway, HP, etc), what it the make model of your computer?
3 - you MUST unplug the power cord or the BIOS will NOT reset. Are you unplugging the power BEFORE you remove the battery?
4 - have you tried using the clear CMOS jumper? It should be on the motherboard, usually close to the battery location. Here's an example:
Notice that the red jumper cap is placed over pins 1-2 & pin 3 is visible. All you need to do is unplug the power cord, then move the jumper cap from pins 1-2 to pins 2-3, wait about 10 seconds, then move it back to pins 1-2 again. That's all there is to it. Plug in the power cord & boot up, then immediately enter the BIOS & correct the date, time & all the rest of the settings.