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I have not noticed any additional battery drain. Microphones typically don't draw a ton of current to operate. I've had a Sony lavalier that operates off a hearing aid battery, and I only replace that battery about every 2-3 years. A light, for example - even an LED light for a short video - will drain much more battery than the microphone.
Sorry, there was a problem. Please try again later.The power from the battery is so nominal, that it will not effect your camera at all. I'm very similar to the power use of a single light bulb in an entire house, not much at all.
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