They’re typically the same size and type. You’ll see this 3V lithium cell labeled as CR123, CR123A, 123, 123A, or CR17345—different names used by manufacturers for the same format commonly used in flashlights, cameras, and security sensors.

• Voltage/chemistry: 3V lithium primary (non-rechargeable).
• Use case: Good for devices that need reliable bursts of power.
• Label check: Match any of the labels above listed in your device manual.
• Replacement tips: Replace all cells in a device at the same time and avoid mixing old and new.

If you prefer rechargeables, look for models clearly marked as rechargeable and confirm your device supports them, as specifications can vary by device.

They aren’t interchangeable. A CR123A is a 3V lithium photo battery that’s shorter and wider than a AAA. AAA batteries are usually 1.5V (alkaline) or 1.2V (rechargeable nickel-metal hydride). Because the size and voltage differ, most devices won’t fit or function correctly if you try to swap them.

• Fit: CR123A is thicker; AAA is slimmer and longer.
• Voltage: CR123A ≈ 3V; AAA ≈ 1.5V (or 1.2V rechargeable).
• Safety: Don’t force a battery that doesn’t fit and don’t mix types in the same device.

Always follow your device manual for the exact battery type it supports to help maintain performance and device safety.

A 123A (often labeled CR123A/123/CR17345) is a compact 3V lithium battery designed for electronics that need dependable power in a small form factor. It’s commonly used in high-intensity flashlights, digital cameras, motion detectors, and home security sensors.

• Why it’s chosen: High energy density in a compact size and steady output for demanding devices.
• Non-rechargeable: Most 123A cells are primary (single-use). Don’t attempt to recharge them.
• Look-alikes: Rechargeable versions exist under different labels; only use them if your device explicitly supports rechargeables.
• Care: Store in a cool, dry place and keep in original packaging until use.

Several factors can lead to higher prices compared to common sizes like AA/AAA. CR123A cells use lithium chemistry and are built to meet the needs of devices that draw higher bursts of power. They’re also a specialized size with different manufacturing and safety handling requirements.

• Chemistry: Lithium materials and construction support reliable output.
• Performance: Designed for high-drain electronics and consistent power delivery.
• Specialized format: Lower production volume than everyday sizes.
• Packaging/handling: Extra care in transport and compliance for lithium batteries.

If you use them frequently, choosing larger pack counts can be practical and may help reduce trips for restocking.

Proceed with caution. Many 16340 (often called RCR123A) rechargeables are typically 3.6–3.7V, which is higher than the 3V of standard CR123A primary cells. Some devices are designed for rechargeables, but others aren’t.

• Check the manual: Only use 16340/RCR123A if your device explicitly supports rechargeable cells.
• Voltage matters: A higher voltage could affect performance or the device if it isn’t rated for it.
• Size/fit: Protected 16340 cells can be slightly longer; verify fit.
• Charging: Charge only with a compatible charger and never try to recharge a primary CR123A.

When unsure, stick with the battery type recommended by the device manufacturer.