I just got a new battery for my MacBook Pro...charged it for 2 days, but the battery icon has an x in the middle. Also the charge LED never goes green, stays on orange.
Try resetting your MacBook Pro's System Management Controller (SMC). The SMC controls power management functions like battery charging, and if it gets into a bad state, it might not charge a battery correctly.
If that doesn't fix it, call support or take it back to the store. Sounds like a bad battery that shouldn't have made it out of the factory.