Most battery doorbells (at the time of writing) offer removable batteries so you can keep a charged one on hand at all times to just swap in when it starts to die. This also means that, as the battery begins to age and lose its full charge capacity, you can easily replace it with a new one.

Knowing who’s knocking at your door is always a relief for peace of mind. And while you can know that with a simple peephole, it’s way cooler and more convenient to be able to check in remotely from anywhere using a video doorbell and a mobile app.