Cradlepoint Battery, 7.2V, 10000mAh: Used with E100, E110 Optional battery pack providing power backup for the E100 router in the event AC power is lost. Under optimal conditions, a single battery pack can provide up to 8 hours of battery run time. The E100 supports adding up to two optional battery packs for a total of up to 16 hours. The battery for the E100 is intended for redundant power only.