Same case, different system
SR cells use silver oxide and are commonly rated at 1.55 V. LR cells use alkaline manganese dioxide and are commonly rated at 1.5 V.
Why devices can notice
Silver oxide typically holds a flatter discharge voltage. An alkaline lookalike may fit but can shorten service life or affect devices that depend on stable voltage.
Replacement rule
Use the chemistry and code specified by the device maker. Treat a same-size chemistry change as conditional, not as an exact match.
Decision boundary
This guide narrows a battery decision but does not override the device manufacturer’s current manual or safety instructions.
Sources
- Duracell — Battery chemistry technical bulletins
Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.
- Energizer — Battery Replacement Guide
Cross-reference codes and manufacturer guidance to replace the same size and type together.