A:Answer Hello! Thank you for your inquiry. Replacement battery model #LIP320 is compatible with Panasonic NV-MX8B device. The mAh rating on this battery is 3000. Compared to your original battery mAh rating, this replacement battery will give you a longer runtime. The higher mAh will hold more energy for each cycle, so your device will run longer per each charge. If you have any further questions, please let us know! Thank you.