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Usually if you just check the camera’s user manual, it will give you the model numbers of the batteries.
Go to either Ebay or some other Battery store and they should be able to match the model number to an equivalent battery.
I have a Sony VX2100. I went to ebay and typed in the Model name and got all of the compatible batteries and some that were longer lasting than the Sony brands. Like Rob said. The store brands I got last up to 12 hours when the name brands don’t.
And they are less expensive.