TagBoost - AirTag CR2477/CR2450 Battery Extender
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Description This is a solder-free AirTag CR2477 adapter. Gives round about 4 years of runtime.
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This is a solder-free AirTag CR2477 adapter.
The CR2477 battery has about four times the capacity of the standard CR2032 used in AirTags, giving you roughly 4 years of battery life.
Anyway, it turns out that at the right angle, you can crank it into the AirTag to reach the contacts.This is a three-part design: A) Case, B) Cap, and C) Carrier. Several Case and Cap designs are available. Just choose one of each (Cap, Case and Carrier); they are all compatible and interchangeable.
The adapter is fully compatible to the original Airtag and the second generation Airtag released in Jan 2026.
Update History:
Release of Version 6 (Sept 26), Changes:
1) Cases with Airtag metal cover Interface added, for the guys who want to keep it close to the Airtag :D.
Release of Version 5, Changes:
1) Closed Cap added
Release of Version 4, Changes:
1) Keyring Cap added
Release of Version 3, Changes:
1) Minor Fixes
2) CR2430 compatible case added (only like 40% more capacity than regular AirTag battery)
3) Battery Carrier reduced in size
Release of Version 2, Changes:
1) 3mm thinner
2) CR2450 compatible case added
Required Components:
1) Airtag
2) CR2477 Battery (Alternatively: CR2450, CR2430)
Here are some links to compatible CR2477 batteries:
-UK, GER, FR , ITA ,ESP ,US , JP
(Some other Button Cells in might have too thick negative poles, so that contacts are not guaranteed. However, I tested Varta Cells as well, which worked just fine )
Settings:
0.16mm layer, 25% infill
Material:
PLA works fine, in case it is used in hotter environments (above 50°C/120°F, like your parked car in Vegas), PETG or ABS are recommended.
Assembly Instructions:
1) Remove the support thoroughly from the bracket.
2) Remove the backplate and CR2032 battery from the AirTag.
3) Insert the CR2477 battery into the bracket.
4) Place the bracket (with the battery) into the case.
5) Align the AirTag contacts with the battery and place the AirTag onto the assembly (make sure it sits correctly).
6) Screw down the cap until you hear the AirTag’s activation sound. Then tighten slightly further (about a ¼ turn) with reasonable force.
Assembly Video:
As usual, I guarantee for nothing ! :D