21700 specifications
Canonical code21700
Formcylindrical
RechargeableYes
Drain markingNot specified
Typical applications
- Rechargeable lights
- battery packs
- specialty electronics
Replacement decision
Resolve the original marking to this profile, then confirm nominal voltage, chemistry, dimensions, polarity and any drain or terminal suffix. Capacity alone does not establish interchangeability.
Technical sources
- Duracell — Battery chemistry technical bulletins
Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.