Using AirTags with Rechargeable Batteries: Why It’s a Bad Idea

AirTags are handy for keeping track of keys, wallets, and even bikes. Most people rely on cheap disposable CR2032 button cells that last about a year, which is simple and inexpensive. Some folks try to cut costs by swapping in rechargeable LIR2032 cells, thinking they’re the same size and will fit just fine. The truth is far different. A CR2032 supplies 3 volts and about 240 mAh of energy, so it can run a small tracker for months. An LIR2032, on the other hand, offers 3. 6 volts but only around 40 mAh—six times less capacity. Even the higher‑capacity LIR2032H tops out at roughly 70 mAh. Because of this, a rechargeable cell needs changing every two to three months instead of yearly, and it often dies without warning.The problem isn’t just frequent replacements. Rechargeable button cells can be drained to a point where they can’t recharge again, potentially leaking electrolyte that may damage the AirTag’s internal electronics. Users have reported damaged tags after using these batteries, and improper charging can worsen the issue. Some businesses hoped to reduce waste by using rechargeables in rental properties, but the extra maintenance and risk of tag failure made the plan unworkable. The short lifespan and potential for damage outweigh any environmental benefit of recycling fewer disposable cells. In the end, sticking with standard CR2032 batteries remains the safest and most reliable choice for AirTags. They’re inexpensive, easy to replace, and don’t risk harming the device.