The battery size chart provides dimensions, voltage, capacity, and common uses for all standard consumer battery types. Use this reference to identify the correct battery for any device or find compatible replacements when the battery compartment label is missing.
Cylindrical Batteries (AA, AAA, C, D, 9V)
| Size | Voltage | Dimensions (mm) | Alkaline mAh | Lithium mAh | Common Uses |
|---|
Coin / Button Cell Batteries
| Model | Voltage | Diameter × Height | mAh | Common Uses |
|---|
Rechargeable Battery Types Comparison
| Type | Voltage | Cycles | Self-Discharge | Best For |
|---|
Battery Selection Guide
This battery size chart helps you identify and select the right battery for any device. The most common consumer batteries are AA and AAA; knowing their differences helps you stock the right ones.
Alkaline vs. Lithium vs. Rechargeable
Alkaline batteries are the best value for typical household devices (remotes, clocks, toys). Lithium batteries are worth the premium for high-drain devices (camera flash, powerful flashlights), emergency devices, and equipment stored in extreme temperatures. NiMH rechargeables pay for themselves after 20-30 uses compared to alkaline.
Coin Cell Identification
Coin cell model numbers encode their chemistry and dimensions. CR cells are lithium (3V); LR/SR cells are alkaline or silver oxide (1.5V). The numbers indicate diameter and height: CR2032 = 20mm diameter, 3.2mm height. CR2025 = 20mm diameter, 2.5mm height — similar but not interchangeable in all devices.
Proper Battery Storage
Store batteries at room temperature in a dry location. Do not store in the refrigerator — condensation can damage battery chemistry. Remove batteries from devices stored for long periods to prevent corrosion damage from leaking batteries. Check expiration dates on lithium batteries for emergency kits.
Frequently Asked Questions
Is this battery size chart free?
Yes, completely free with no signup required.
What is the difference between AA and AAA batteries?
AA batteries are larger (14.5mm diameter × 50.5mm length) and hold more energy — typically 2,000-3,000 mAh vs. 800-1,200 mAh for AAA. AA batteries last longer in high-drain devices. AAA batteries are used in smaller devices where space is limited.
What does mAh mean on a battery?
mAh stands for milliampere-hours — a measure of charge capacity. A 2,000 mAh battery can deliver 2,000 mA for 1 hour, or 200 mA for 10 hours, etc. Higher mAh generally means longer runtime, but actual battery life also depends on the device's power draw.
Are all AA batteries the same size?
All AA batteries use the same standard dimensions (14.5mm × 50.5mm) regardless of brand or chemistry type (alkaline, lithium, NiMH). The chemistry affects voltage, capacity, and performance in temperature extremes, but not the physical size.
What battery lasts longest — alkaline, lithium, or NiMH?
Lithium batteries last longest in high-drain devices and extreme temperatures, with a 10-20 year shelf life. Alkaline batteries offer the best value for typical household use. NiMH rechargeable batteries have higher upfront cost but are much cheaper long-term for frequently used devices.
What are button/coin cell batteries used for?
Coin cell batteries (like CR2032, CR2025, LR44) power small devices: watches, key fobs, calculators, hearing aids, small remotes, medical devices, and computer BIOS/CMOS chips. The CR2032 is the most common, used in many watches and car key fobs.