Thank you sirThe original mount plus the screws weighs 5.5 oz, the new style mount + screws is 3.9 oz. and the IPS5 battery (8 hour) weighs 4.7 oz. So take the base weight add the 3.9 oz and the 4.7 oz and you should have your answer. If you already have one with the original mount, subtract the difference or (1.6 oz) and you have the answer you are looking for.