We have a battery store chain called "battery plus" that will have the battery and solder your pigtail on for about 1/2 the mfr. price. Maybe you have a similar or same store by you.

Excellent suggestion - as a matter of fact that is exactly where I went this afternoon. There's a store about 15 miles from here. I picked up a Werker 2.9 AH battery and had a coupon from their web site. $18 for a replacement is the best deal around. They even took a dremmel to the battery box rails on the bottom to get the new bigger battery to fit.