NOK 5G21 Gateway Battery Backup

WildBillPDX wrote:

It just replaces the original power supply and plugs into the barrel connector on the back of the gateway, NOT the UPS plug on the device.

 

 

Update please. Did you test how long it would keep the gateway going operating on the backup with no ac input? If i am figuring the math correctly using the specs provide from T-Mobile specs, Amazon, and the user average draw for the T-Mobile can of 7W avg pwr / 45W max power, this is a 74Whr battery so.... 74÷7=10.6 hrs of average and 74÷45=1.6 hrs min during maximum power draw of backup power supply. Does your testing comfirm anything close to these figures of  1.6 to 10.6 hrs of operation on backup using this product?