Curious how long do you charge your doorbell e340?
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If it helps I purchased a plug off Amazon for ring doorbell so is hard wired I find this way better personally as I have plugs behind the door. Not sure if it helps you but personally for battery life would use balanced
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Not sure if this helps, but I purchased a second battery from Amazon and I keep on max surveillance, I don’t want to miss ANYTHING. That’s just me 
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I just check the battery power on my phone and make sure it’s charged all the way. Sorry, I am not sure about how long it is though.
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If you mean how often about every 2 months. I have a spare battery
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I bought an extra battery so much easier but normally not less than 4 hours
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