How long does the doorbell batteries last without being hard wired?
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It depends. For me about 2-3 months. I have a spare battery and hot swap it as it takes a few hours to charge
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I have had mine in for 1 year now without changing the battery.
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It really depends on you settings. The more you try to capture, the more battery it eats up.
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Wow really a year? That is very impressive. May I ask the model of doorbell you have pls? Mine never last that long 
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ive had the E340 for 3 weeks and used 50% of the battery, I have been using the settings and trying to connect it to a Homebase too, all be it unsuccessfully
It depends on if you have traffic coming through ringing your doorbell
I get occasional traffic captured on my wireless doorbell. It lasts around 3-4 months before the low battery warning comes on.
Changing stock settings to Optimal Survalence, and customizing options to ensure correct motion detection, and radar detect (beta) on - 4-5weeks.
Mine only last 4weeks
Ours was an average 3 months give or take depending how much activity is going on outside &/or your settings.
Mine last about 4 weeks also but seems to be alot of traffic driving by.
5 days for me with non stop activity
Varies widely based on your settings
Haha, I thought it was eufy, but it’s not. It’s a blink doorbell.
Thanks for clarification
I have my settings, set to optimal surveillance, and the battery last about a month, but I bought a back up battery that I always keep charged and rotate them out. 
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I accidentally replaced my batteries in my blink doorbell with regular Energizer AAs and it wouldn’t last longer than a week… LOL 
Apparently they tell you to use lithium ion batteries for a reason.
MUCH happier with my eufy products!
A week before having to charge again