What the suffix signals
Traditional W and SW markings distinguish application and drain behavior within a silver-oxide size family.
Why one package may list both
Modern multi-drain products and manufacturer packaging sometimes consolidate historical references, but the original device requirement still matters.
How we classify them
Same case, chemistry and voltage with a different drain marking is conditional unless a source explicitly resolves both codes to one multi-drain product.
Decision boundary
This guide narrows a battery decision but does not override the device manufacturer’s current manual or safety instructions.
Sources
- Energizer — Battery Replacement Guide
Cross-reference codes and manufacturer guidance to replace the same size and type together.
- Duracell — Battery chemistry technical bulletins
Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.