Batteries / LR
LR66
Alkaline zinc / manganese dioxide
Second-source check pending Primary batteryReviewed:
Reference dimensions are not universal manufacturing tolerances. Check the actual cell and holder.
The type status describes documentary checks of core specifications, not every fact or suitability for a device.
Understanding LR66 before replacement
Identify the actual battery
LR66 is a documented Alkaline zinc / manganese dioxide primary cell with a nominal voltage of 1.5 V. Its reference diameter is 6.8 mm and its reference height is 2.6 mm. These are nominal reference dimensions, not a promise that every manufacturer has identical tolerances.
This dataset describes a non-rechargeable bare cell, without solder tabs or wires. A tabbed or wired assembly requires a separate fit check.
What markings identify this type?
The dataset associates AG4, LR626 with LR66. The manufacturer may use a different label on the package. These references help identify the type; they do not certify the battery for a particular device.
Similar dimensions in this catalogue
The following types share the same reference diameter as LR66. Their height, chemistry or voltage may differ. They are comparisons, not approved substitutes:
What to check before replacing LR66
Read the original device marking, verify nominal voltage and chemistry, compare diameter and height, and check the contacts and load requirements. Same diameter, identical voltage, or a familiar brand prefix alone is not enough to establish interchangeability.
The available data contains no affirmative device-specific fit test for LR66. A missing compatibility relation means “not assessed,” not “compatible.”
How reliable are these specifications?
The principal characteristics are currently supported by one primary source. A full independent second-source comparison is still pending.
Technical specifications
| Designation | LR66 Documented source [CAMELION] |
|---|---|
| Chemistry | Alkaline zinc / manganese dioxide Documented source [CAMELION] |
| Nominal voltage | 1.5 V Documented source [CAMELION] [everActive / Baltrade] |
| Diameter | 6.8 mm Documented source [CAMELION] |
| Height | 2.6 mm Documented source [CAMELION] |
| Rechargeable | No Documented source [CAMELION] |
| Terminal form | Bare cell without tabs or leads Documented source [CAMELION] |
| Body form | Button cell Documented source [CAMELION] |
Reference dimensions are not universal manufacturing tolerances. Check the actual cell and holder.
Other designations
These codes identify the same type family. Match the load variant, terminals and device requirements separately.
AG4[CAMELION]LR626[everActive / Baltrade]
Documented brands
Brand presence comes from product documents or documented code mappings; current availability is not checked.
Product-specific observations
Capacity belongs to an individual product and test regime. It is not a universal value for this battery type.
CAMELION AG4/LR66Documented source
Current availability not checked [CAMELION]
Documented product; no individual technical observations in this dataset.
everActive LR626/LR66Documented source
Current availability not checked [everActive / Baltrade]
| Diameter | 6.7 mm Documented source [everActive / Baltrade] |
|---|---|
| Height | 2.5 mm Documented source [everActive / Baltrade] |
Replacement limits
Device compatibility has not been verified. Dimensions alone do not prove that a battery fits or works.
Replacement evidence by category
Other markings of this technical type
AG4 · LR626
These markings resolve to this type in documented sources. The exact variant and device requirements still matter.
Conditional replacement: review requirements
No conditional cross-type relation is recorded.
Known obstacles to direct replacement
No explicit obstacle is recorded here; that is not evidence of compatibility.
Other type pairs without a recorded assessment
This pair has not been assessed. No compatibility conclusion is available.
No automatic replacement recommendation. Device compatibility has not been verified. Dimensions alone do not prove that a battery fits or works.
Documentary limits
LR66: Published dimensions differ by manufacturer or reference method; tolerances and fit have not been established. Published technical records: CAMELION 6.8 × 2.6 mm (product), 6.7 × 2.5 mm (table); everActive 6.7 × 2.5 mm. Device-level compatibility must be verified separately.
Sources & verification
- CAMELION · v023-camelion-ag40 Documented source
AG Button Cell Battery Set (40 pcs), LR60 and LR66 technical sections
Current availability not checked
· Reviewed: - everActive / Baltrade · v023-ever-lr66 Documented source
LR626 LR66 AG4 Technical Data Sheet
Current availability not checked
· Reviewed:
Common questions
What size is LR66?
Ø 6.8 × 2.6 mm
Can LR66 be recharged?
No. Do not charge primary cells.
Can LR66 replace another battery?
Not on the basis of size or matching names alone. Check the exact device requirements and the directed compatibility notes. This catalogue does not contain a guaranteed device-fit recommendation for LR66.
How does LR66 differ from SR66?
LR66 and SR66 have reference heights of 2.6 mm and 2.6 mm respectively, and nominal voltages of 1.5 V and 1.55 V. Their chemical systems are Alkaline zinc / manganese dioxide and Silver oxide / zinc. These comparisons do not establish a permitted replacement.
Open technical comparison: SR66
This is a technical comparison, not an equivalence or fit certificate.