The watt hour rating of a battery indicates how many watts it can deliver for one hour. If your camera draws 30 watts (1/3 of 90), a 90WH battery should give you approximately 3 hours, assuming a brand new battery is being used. Run times will decrease of course during the life of the battery.

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Hi Alister,

Can you let me know which setting work for your Swit batteries?

Thanks in advance.

Cheers, Tim.