A 10-Year Battery for AirTag

Original Article ↗ Hacker News Discussion ↗

Battery life, chemistry, and the “10‑year” claim

  • Some argue “that’s not how batteries work” and expect real life closer to 2–3 years.
  • Others cite Energizer Ultimate Lithium AA datasheets (≈25‑year shelf life, ~3,500 mAh) and low self‑discharge to say 10 years is plausible when replacing a ~200 mAh CR2032.
  • Lithium primaries are highlighted as far more leak‑resistant than alkalines and widely used in “10‑year” smoke alarms.
  • Concern: AA cells or contacts might age or leak before 10 years, especially if people ignore the “use lithium” guidance and install cheap alkalines.

Size, use cases, and UX trade‑offs

  • Many find the enclosure too big for keys, wallets, pets; better suited to luggage, camera bags, tools, RVs, boats, storage units, etc.
  • Some say annual CR2032 replacement is trivial, especially with Find My low‑battery alerts; others complain of “battery fatigue” when managing many tags and other sensors.
  • A recurring theme: “set it and forget it” is valuable for rarely accessed or hard‑to‑reach locations (hidden in cars, trailers, cases, time capsules).

AirTag protocol longevity and Apple obsolescence

  • Skeptics doubt AirTags and protocols will be fully supported in 10 years, citing Apple’s history of deprecating ports (FireWire, etc.).
  • Others argue Apple tends to support accessories for a long time, that AirTags ride on the broader Find My ecosystem, and that cutting off v1 entirely would anger customers heavily invested in tags.

Theft tracking vs. loss prevention and stalking concerns

  • Strong debate over whether AirTags are useful for anti‑theft:
    • Pro: Numerous anecdotes of recovering bikes, cars, luggage, and cameras by tracking tags, often involving police assistance. Hidden placements and disabling the speaker can make removal hard.
    • Con: Anti‑stalking features (iPhone/Android alerts, chirping) and ease of physical removal make them unreliable against determined thieves; they’re designed primarily for “lost,” not adversarial scenarios.
  • Some worry longer life + waterproof, muffling enclosures could aid stalkers; others call this overblown given existing ways to hide tags and system‑level anti‑tracking alerts.

Reliability, software, and hardware aging

  • A few question whether AirTag firmware or protocol assumptions (e.g., key rotation, watchdog behavior, memory leaks) were designed for 10× expected battery life; others note watchdogs and constrained RAM would expose most bugs well before a year.
  • Disagreement over whether other components (sensors, capacitors) or software aging make 10‑year expectations unrealistic; some cite decades‑old electronics still working fine.

Alternatives, DIY, and adjacent products

  • Multiple DIY suggestions: CR2032‑to‑AA adapters, 3D‑printed housings, OpenHaystack‑based NRF52 beacons with AA packs, and cheap Chinese enclosures.
  • Comparisons to cellular/NB‑IoT asset trackers: more expensive and subscription‑based but better for theft, since they lack anti‑stalking constraints.
  • Some prefer rechargeable or different form‑factor trackers (credit‑card shapes, bike‑integrated mounts) over a bulky AA pack.