Have an extra battery ready for your Netgear MR1100 AT&T Nighthawk M1 LTE Mobile Hotspot Router if your charger isn't handy or if your battery is drained. This battery is supercharged at 5040mAh. Actual usage time will vary based on user settings, feature use and network. Optimum battery life with approximately 360 charging cycles. For best results and performance, battery should be changed after 360 charging (approx. 12 months) Never leave Hotspot plugged in to charge for longer than 24 hours. Allow battery to drain and re-charge. Leaving Hotspot plugged into charger without allowing battery to drain, may affect performance of battery and/or ruin battery/device. Hotspot should never be left to charge in direct sun, or extreme temperatures (0F/-18C - 113F/45C). If the battery or device begins to overheat, turn off the device immediately and unplug device from any cables or power source until device returns to normal temperatures. Do not disassemble, crush, short circuit, puncture, break or put a high degree of pressure on battery. Do not attempt to alter battery. Do not expose to extreme temperatures (0F/-18C - 113F/45C) Do not use chemicals, paints, or cleaning solvents to clean or paint device or battery. Never dispose of in fire or water. Use specified original charger only at all times. Fully charger before initial use. Never charge battery for longer than 24 hours. In case of battery liquid leakage, keep away from eyes and skin. Keep away from infants, children, and pets. By installing you are assuming full responsibility, and no other parties will be held responsible for any misrepresentations or misuses of product by installer or end-user.