AnswerLR626, AG4, LR66 are the supported exact aliases for one 6.8 × 2.6 mm alkaline button cell. No other family is treated as an automatic replacement.
- Format
- Alkaline button cell
- Dimensions
- 6.8 × 2.6 mm
- Voltage
- 1.5 V nominal
- Chemistry
- Alkaline manganese dioxide / zinc
- Drain context
- General-purpose alkaline; sloping discharge profile
- Rechargeable?
- No — primary cell; do not recharge.
- Capacity context
- Manufacturer-, load- and cut-off-specific; use the linked datasheet for a qualified figure.
- Confidence
- High
Supported application context
- Devices whose battery compartment or manual specifies LR626 or a listed alias
Application context is limited to the scope stated in GP177F Alkaline Button Cell Product Specification; it is not a device compatibility claim.
This alkaline family is often sold beside a same-size silver-oxide option. The shared envelope explains the confusion, but the chemistry and voltage profile prevent an unqualified direct-replacement claim.
LR626/AG4 shares 6.8 × 2.6 mm dimensions with SR626SW/377 and SR626W/376. The first decision separates alkaline from silver oxide; the second preserves the watch-cell drain suffix.
Commonly confused
What the code means
LR626 is the IEC-style alkaline button-cell identity. The other codes listed here are evidence-backed commercial or manufacturer aliases, not separate battery sizes.
Discharge and drain behaviour
Alkaline button cells have a more sloping discharge curve than same-size silver-oxide cells. Runtime and delivered voltage therefore depend strongly on load and the device cut-off.
Capacity context: Manufacturer-, load- and cut-off-specific; use the linked datasheet for a qualified figure.
Substitution guidance
Treat only the listed aliases as exact. Same-size silver-oxide families differ in chemistry, nominal voltage and discharge behaviour; use one only when current device or manufacturer guidance permits it.