The Tentacle Sync R00 is the battery and housing replacement kit for the Tentacle ORIGINAL timecode generator made from 2015 to 2017. Tentacle specifies a 400 mAh replacement battery and provides a dedicated tutorial for carrying out the replacement on this model.

Official kit contents:

• Lithium-ion battery
• New Tentacle ORIGINAL housing
• Hook tape and loop tape
• Rubber band
• Foam rubber strip
• Instructions and a link to the video tutorial

R00 is the reference for the 2015–2017 ORIGINAL. Tentacle lists separate kits, R01 for SYNC E and R02 for TRACK E, so the device model should be confirmed before it is opened.