The battery in a Blink doorbell comes out from the front, takes two AA batteries, and takes about two minutes to swap

Your Blink doorbell runs on two standard AA batteries that sit inside the camera unit itself. When the battery level drops to around 10 percent, the Blink app sends you a notification. You do not need to call anyone or buy a special part — you open the front cover, slide out the old batteries, and slide in new ones. The whole job takes longer to find a screwdriver than to do the actual swap.

The doorbell will keep working while the battery is low, but it may stop recording video or responding to motion alerts once it fully drains. Changing the batteries before that happens keeps your doorbell running without interruption.

Key Takeaways

  • Blink doorbells use two AA batteries that you can buy at any grocery store or pharmacy, not proprietary batteries.
  • The battery cover is on the front of the doorbell and comes off with a small Phillips screwdriver or coin.
  • The app will notify you when the battery level drops to around 10 percent, giving you time to plan the swap.
  • After you insert new batteries, the doorbell reconnects to your Wi-Fi automatically — you do not need to reset it.

What you need before you start

Gather two AA batteries (alkaline or rechargeable both work), a small Phillips screwdriver or a coin, and a flat surface where you can set the doorbell down. You do not need to turn off the doorbell or disconnect it from power — it runs only on batteries, so there is no plug to unplug.

If you do not have a Phillips screwdriver, a dime or penny works just as well to turn the screw. Some Blink models have a cover that pops off without tools, but most require one screw.

The step-by-step process

Start by locating the small screw on the front of your doorbell, usually near the bottom or on the side of the faceplate. Turn it counterclockwise with your screwdriver or coin until the cover comes loose. The cover is plastic and light — it will not fall hard, but hold it gently so it does not drop.

Inside, you will see two AA batteries sitting side by side in a plastic holder. Note which direction they are facing (the flat end or the bumpy end pointing toward the top). Slide the old batteries out toward you — they should come free without force. If one is stuck, wiggle it gently side to side.

Insert the new batteries in the same direction as the old ones were facing. The flat negative end should point toward the spring inside the holder. Slide them all the way in until they sit flush. Close the cover and turn the screw clockwise until it is snug — do not overtighten, or you may crack the plastic.

The doorbell will reconnect to your Wi-Fi within 30 seconds. You will see the light on the front blink or turn solid, depending on your model. Open the Blink app and check the battery level — it should now show 100 percent or close to it.

When to change batteries before the app tells you

The app notification usually arrives when you still have time, but if you live somewhere very cold, battery drain happens faster. Alkaline batteries lose power more quickly in temperatures below 40 degrees Fahrenheit. If your doorbell is outside in winter and you see the battery warning, change them within a week rather than waiting.

Rechargeable AA batteries (like Eneloop or Amazon Basics rechargeable) work in Blink doorbells but drain faster than alkaline batteries in cold weather. If you use rechargeable batteries, check the app every month during winter months.

What happens if the battery dies completely

If the battery drains all the way, the doorbell stops recording and stops responding to motion. It will not reconnect to Wi-Fi or send alerts. The doorbell is not broken — it straightforward has no power. Insert new batteries and it will come back to life within 30 seconds, exactly as if you had just changed them during normal use.

You will lose any video or events that happened while the battery was dead, but the doorbell itself is not damaged. There is no risk of breaking it by letting the battery fully drain.

Battery life and how long they actually last

How long a set of batteries lasts depends on how often your doorbell records. If your doorbell records 10 to 20 times per day (motion alerts, people pressing the button), batteries usually last 6 to 12 months. If it records 50 or more times per day, you may need to change them every 3 to 4 months.

The Blink app shows you the battery percentage, so you can track how fast yours drains. If you notice the battery drops 10 percent in a week, you know you will need new ones in about 10 weeks. This helps you plan ahead instead of being surprised by a dead doorbell.

Troubleshooting if the doorbell does not turn back on

If you insert new batteries and the doorbell does not light up or reconnect, remove the batteries and wait 10 seconds. Reinsert them, making sure they are facing the correct direction — the flat end should point toward the spring. If it still does not work, try a different set of new batteries, because occasionally a battery is defective.

If the doorbell still does not respond after trying a second set of batteries, the unit itself may have a hardware problem. Contact Blink support with your doorbell's serial number (printed on the back) and they can help you troubleshoot or arrange a replacement.

Frequently Asked Questions

Can I use rechargeable batteries in my Blink doorbell?

Yes, rechargeable AA batteries work in Blink doorbells. They drain faster than alkaline batteries, especially in cold weather, so you may need to change them more often. Alkaline batteries are usually the better choice if your doorbell is outside year-round.

Do I need to reset the doorbell after changing the battery?

No. The doorbell reconnects to your Wi-Fi automatically within 30 seconds of inserting new batteries. You do not need to press any buttons or open the app to reset it.

What if I lose the screw when I take the cover off?

Blink sells replacement screws, but you can also use any small Phillips screw from a hardware store — they are inexpensive and standard. If you cannot find a replacement quickly, a small piece of tape can hold the cover on temporarily until you get a screw.

How do I know which way the batteries should face?

Look at the plastic holder inside the doorbell. One end has a metal spring, and the other end is flat. The bumpy end of the battery (positive terminal) should face the spring. The flat end (negative terminal) should face the flat side of the holder.

Will the doorbell stop working if I do not change the battery right away after the warning?

The doorbell will keep working for a while after the warning, but it may stop recording or responding to motion once the battery gets very low. Changing them within a week of the warning keeps your doorbell running without gaps in coverage.