Battery too expensive?

[WildWinds]

When I bought my extra camera battery I paid $70 for it. I understand that the batteries that are used are expensive but is this just too expensive? On BatteryBarn they have a battery that will work with my camera for $13. Has anyone bought batteries from BatteryBarn? The battery does have a 1 year warranty which is nice but will I be sacrificing quality for money?
Note: The battery is for FZ5

[genece]

That battery from the Battery barn is fine and they are a good retailer ...I just bought 3 batteries from them and one did not fit correctly ...one Email and they have another on the way with a Postage paid envelope to return the other one.