Designed to be a replacement or a spare for longer shoots, the Li-Ion MONOBATT Replacement Battery for Daylight and Bi-Color PortaBright Monolights from Genaray is a 6600mAh power source that will give you about 1.5 hours run time at full power on a five-hour charge. The 11.1V output battery can be charged approximately 300 times.
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I have 5 of these. None of them work with the Genaray light anymore. The Gradus Group (who you talk to about replacements, etc) are useless and rude. Genaray makes horrible products. Find something better elsewhere.
I bought two extra batteries even though one worked just fine!!