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The DSM U-84 battery is rated at 84Wh and is the same size as an original BPU-60 which is rated at 55Wh. But feedback from people using the battery, say it powers their camera longer than a Sony BP-U90 that is rated at 85Wh.

DSM Batteries are fully guaranteed for 2 years

DSM U84 fully charged 352 minutes

Sony U60 fully charged 231 minutes

This battery is a direct replacement for the Sony BP-U60 type battery typically used on the smaller Sony PMW cameras like the PMW-150, 200, EX1, EX3 and F3. It docks directly with the camera and does not need to use a cable or any other adapter to power the camera. This is particulary significant for PMW-100, 150 and 200 users as the cameras power socket is located inside the battery compartment making it impossible to use an external power source when a battery is inserted.

The capacity of the DSM-U84 is 84Wh so about 20% more capacity than the BP-U60 but in the same sized package. In my tests this did equate to around 20% more run time on my F3, about 3 to 3.5 hours which I think is pretty good. Like the original Sony battery it has an LED capacity meter on the rear of the pack and the quality of the plastics used appears very good. The battery uses high quality Japanese sourced Panasonic cells so should give a long service life. You can charge it using the standard Sony charger.