LR626 is a common button cell size with multiple cross-codes. You’ll typically see these equivalents:

• Alkaline equivalents: LR626, AG4, LR66, G4, 177
• Silver oxide equivalents (same size, different chemistry): SR626, SR626SW, SR66, 377

All share the same physical size, but silver oxide versions often provide a steadier 1.55V output and may offer different runtime characteristics than alkaline 1.5V options. For the best match, use the code shown in your device or on the old battery. On Walmart.com, you can filter by chemistry and pack count to narrow choices. If switching chemistries, monitor performance and choose what suits your device’s needs.

They’re the same size, but differ in chemistry and performance traits.

• LR626: Alkaline chemistry, typically 1.5V. It’s a practical choice for basic, low‑drain items like small remotes or calculators.
• 377 (SR626): Silver oxide chemistry, typically 1.55V. It’s known for steadier voltage, which can be helpful for precision devices such as watches.

Many devices accept either, though some specifically recommend silver oxide. Check your manual or the code on the old cell. When a device uses multiple cells, replace them together with the same type and age. If results aren’t as expected, consider matching the chemistry your device maker specifies.

SR626 is the silver oxide version of this size. Your best alternative depends on what the device calls for:

• If it lists SR626 or 377: Choose a silver oxide cell. You may see SR626SW (low drain) or SR626W/376 (higher drain). Matching the suffix can support consistent performance.
• If it lists LR626/AG4: Alkaline cells are the same size and can work in many simple, low‑drain devices, though runtime characteristics can differ from silver oxide.

Check the code stamped on the old battery or in the manual. If you change chemistries, test the device and switch back if accuracy or longevity isn’t meeting your needs.

LR44 and LR626 are different sizes, so they’re not direct substitutes.

• LR626 family: Look for codes like AG4, LR66, 177, and 377/SR626 on packaging; these indicate the same size.
• LR44: A larger button cell used in devices specifically designed for that size.

Because the dimensions differ, an LR44 generally won’t fit a device that needs LR626 and could damage contacts if forced. The most reliable approach is to match the code printed on your current battery or in the device manual. When in doubt, choose from the LR626 cross-codes rather than upsizing.

Swapping in a new LR626 can be simple with a few careful steps:

1. Confirm the code: Check the old cell or manual for LR626/AG4 or SR626/377.
2. Mind polarity: Match the +/− symbols in the battery compartment before closing.
3. Handle carefully: Use dry hands; avoid shorting the cell with metal tools.
4. Don’t mix types: Replace all cells in a set with the same chemistry and age.
5. Test and store: Verify device operation and keep spares in a cool, dry place, in original packaging.

Dispose of used cells through local battery recycling options. Keeping batteries out of reach of children and pets is always advisable.