In the same way, the BR1500MS2 left most contenders during the dust when it arrived to battery capacity, since it ran for 4 hours at a twenty W load and 21 minutes at a 300 W load. The only competition that arrived close had been our top rated pick and the CyberPower CP1500PFCLCD (the latter was also the only UPS to conquer the BR1500MS2 in output,