Battery Size Guide: Which Battery Does It Take?
Battery sizes are a small alphabet with big consequences for a dead remote. This guide matches common devices to the size they usually take.
What is the Battery Size Guide?
Choose a device and the tool tells you the battery size it typically uses, plus a note on rechargeable options. Devices vary by model, so always check the device itself or its manual — this guide covers the common case, not every variant.
How to use it
- Choose a device.
- Click Show Battery Size.
- Read the typical battery size and the rechargeable tip.
Worked example
A TV remote typically uses AA batteries, with two batteries being the common count.
Are rechargeable batteries worth it?
For high-use devices like remotes and mice, yes: rechargeable NiMH batteries pay for themselves quickly and cut waste.
Frequently asked questions
Why do smoke alarms use 9V batteries?
Because many older alarms were designed around the 9V block. Newer alarms often use a sealed lithium cell instead.
Should I trust this guide over the device?
No. The device or its manual wins — models vary, and this guide covers the common case.