I bought two of these batteries. Unfortunately, the batteries are housed in a hard plastic case. This case is too big for the space inside the AT&T 9400 phone. The battery is about 1/8 inch longer. I'm surprised that the description in the Revain ad, as well as the battery itself, says it actually fits in the AT&T 9400. I have two of these phones. The battery definitely cannot be squeezed or coaxed to fit in this phone. Of course I can't tell you if the batteries are working well, no.
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