I ordered this product from OEM. I never recieved the product I ordered. OEM did try and make this right by convincing me to take my review down and sending me out another back to the battery. But they sent me out the exact same back that went to a NEXTEL phone not a KRZR. I still have not recieved the correct back and have no way to use a battery with no back that fits. I have no idea how the battery works or doesn't work. I would NEVER order from OEM and if you do and they screw up your order don't take down your review until you actually have the correct item in hand. In my opinion OEM is a joke.