Canon BP
With an ultra high power capacity of 48.8 Wh / 6600 mAh, the RP-BP975 can power HD video camcorders and a multitude of other units for more than 5 hours at full load.
RP-BP975 contains a built in 4-LED power meter that, at the press of a button, displays the remaining battery percentage at 100%, 75%, 50%, or 25%.
Using the built in data communication chip, the battery syncs with the camcorder to display the exact power percentage on the LCD monitor.