I have a nikon d60 camera, i need a second backup battery and was wondering?

Question

on the battery it says 1000mAH. can i use a battery that has 1200 or 1800 aMH oh the battery is a en-el9 lio rechargable battery. and i don't want to pay54.00 for an extra battery

Answer 1

If you really need an extra battery the $54 is nothing when compared to the damage a generic battery can do to your camera.  Overheating (which can damage the battery) and even explosion or fire can result is using some generic batteries.

Save your money and buy a battery grip when you can afford it.