i have an m60 and the "tester" battery is shit so what battery should i use? i was thinking of getting the high power small type matrix 1500 battery from evike but i want someone who has battery know how opinion

http://www.airsoftpost.com/matrix-high-output-1500mah-nimh-small-type-battery-p-29056.html
is what i was thinking

I would get this: http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2392
It is the same thing as the one in your link just 2200 mah instead of 1500 and much cheaper than on any airsoft site.
www.batteryspace.com has some really good deals on airsoft batteries. Check them out.