PSA: Don't replace your AirTag battery with a rechargeable one - or else this happens

2026-02-13 · Source: News and Advice on the World's Latest Innovations | ZDNET · Field: Technology & Digital — Internet of Things (IoT) & Connected Devices, Emerging Technologies & Innovation · Depth: Novice, short

Summary

Apple AirTags, designed to help users track lost items, are powered by disposable CR2032 button cells, which typically last about a year. While some users find the annual disposal of these batteries wasteful, replacing them with rechargeable LIR2032 Li-Ion cells is strongly discouraged. Although LIR2032 batteries are physically similar in size to CR2032s, they possess critical electrical differences: CR2032s have a nominal voltage of 3V and 240mAh capacity, whereas LIR2032s operate at 3.6V with a significantly lower 40mAh capacity (or 70mAh for LIR2032H). This mismatch leads to much shorter battery life, requiring changes every two to three months, and can cause rapid, unannounced power loss. Furthermore, LIR2032 cells are prone to damage from deep discharge or incorrect charging, and have been observed to leak electrolyte, potentially damaging the AirTag itself.

Key takeaway

For AirTag owners considering rechargeable battery alternatives to reduce waste, you should avoid LIR2032 cells. These batteries, despite their similar size, have different voltage and significantly lower capacity than the required CR2032s, leading to frequent replacements and potential device damage. Stick to high-quality disposable CR2032 batteries, such as Energizer Color Alert cells, to ensure optimal performance and prevent harm to your AirTags.

Key insights

Do not use LIR2032 rechargeable batteries in devices designed for CR2032 disposable cells due to voltage and capacity differences.

Principles

• Battery chemistry dictates compatibility.
• Higher voltage can damage electronics.

In practice

• Use only specified battery types.
• Avoid LIR2032 in AirTags.

Topics

• Apple AirTags
• CR2032 Batteries
• LIR2032 Batteries
• Battery Compatibility
• Device Damage

Best for: General Interest, Tech Journalist

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Editorial summary, takeaway, and curation by AIssential. Original article published by News and Advice on the World's Latest Innovations | ZDNET.