C2 - 19 mm ID (Carbon)
C3 - 19.5 mm ID (Aluminum)
BBB Basic - 19.65 mm ID (Aluminum)
SLK Carbon - 20.5 mm ID (Carbon)
Ad hoc solutions using tape and foam have multiple issues. The net result is often a damaged or stuck battery.
Problems with Tape or Foam:
Removing the holder requires pliers. Never use pliers on the battery itself.
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