AC power drops at the branch and your router goes dark. Now you're offline, and the phone line's dead too. This battery pack is your safety net. It slots into the Cradlepoint E100 or E110 and kicks in the moment mains power fails. Under optimal conditions, one pack gives you up to 8 hours of runtime. Need more? The E100 takes two packs, pushing you to 16 hours. One thing to be clear on: this is redundant backup power only. It's not a replacement for your AC supply or a UPS. It's the "just long enough to ride out the outage" battery. Five units in stock right now. Add to cart if your E100 or E110 doesn't have one fitted yet