My battery is dying quickly and it's brand new. It only lasts about a half hour, not even taking 100 shots! Today I tested my theory. I charged it until it was completely full. I went out and it only lasted about 30 minutes. My dad's nikon can last 3-4 hours of shooting. Should i call Canon support? Will they send me a new one in the mail and when it arrives, i put the dead one in the box and ship it back? I would prefer to have a battery that somewhat works, rather than not have one for the 2 weeks that they'd take to ship me one... Any ideas?