Netgear Nighthawk M1 Mobile Router Add-On Battery

All-day mobile WiFi. The Nighthawk lithium-ion battery (5040mAh) works with the Nighthawk M1 Mobile Router (MR1100). Rechargeable and compact to take on the go, you can use and share your mobile router with up to 20 WiFi devices all day for up to 11 hours.