Rechargeable item tracker or a coin cell: which wins?

What is a rechargeable item tracker?

A rechargeable item tracker contains a sealed lithium cell that you top up through a cable or a wireless pad, and that you cannot remove or replace.

The cell is soldered or clipped inside a case that is not designed to be opened, which is what lets the maker seal the body more aggressively and shape it more freely. Pebblebee's Clip range is the best known example on sale in Britain, and the Clip 5 specification quotes up to twelve months from a full charge.

Card-shaped trackers are rechargeable almost by definition, because a bank card's thickness leaves no room for a coin cell at all. We went through that constraint in item tracker shapes compared.

What is a replaceable coin cell tracker?

A replaceable coin cell tracker runs on a standard CR2032 button battery that you unclip and swap yourself when it runs down.

The CR2032 is an industry part rather than a proprietary one. It is a 3 volt lithium manganese dioxide cell, roughly 20 millimetres across and 3.2 millimetres thick, made by Panasonic, Energizer, Duracell and a dozen others, and sold in every supermarket in the country. Chipolo's support pages quote up to two years from the cell in the ONE, and that figure is typical of the coin cell category.

Swapping one is a twist of the back cover and a press of a new cell into a clip. There is no soldering, no tool and no visit to anybody.

How long does each type actually last?

A coin cell tracker typically goes about twice as long between interventions, but the intervention costs money instead of ten minutes on a charger.

The last row matters more in Britain than the specification sheets suggest. A tag lives in a coat pocket, on a bike or in a car overnight, and coin cells are specified across a far wider temperature band than the rechargeable chemistry is.

Which is cheaper over five years?

The coin cell tracker, by a small margin, and the gap widens the longer you keep it.

Take a five year window and count. A coin cell tag needs roughly two or three replacement cells in that time, which is somewhere around one to two pounds in total if you buy them in a strip rather than singly. A rechargeable tag needs about five charges, which cost essentially nothing in electricity.

So far the rechargeable wins on pence. The difference is what happens at the end of the window. A sealed lithium cell is generally specified for a few hundred full charge cycles before its capacity is meaningfully reduced, and the cell is not user serviceable, so a rechargeable tracker has an expiry date built into it. A coin cell tracker does not: fit a fresh cell and it is as good as it was on day one, indefinitely, until something physical breaks.

That is the real trade. You are choosing between a small recurring cost with no end, and no recurring cost with a hard stop.

Which should you buy?

Choose rechargeable if you want a card that fits a wallet slot or LEDs and extra features, and choose a coin cell if you want the tag to disappear into your life for two years at a time.

The honest test is how you behave, not what you prefer in principle. A charging cable is a task, and a task that arrives once a year is a task that gets forgotten, because nothing in your routine reminds you. A dead tracker discovered on the day you lose something is worse than either battery type.

Three situations where the answer is not close:

1. A tag you will never see. Sewn into a bag lining or taped inside a case, it must be a coin cell. You are not unpicking a lining for a charge.
2. A wallet card slot. There is no coin cell thin enough. Rechargeable is the only option that physically fits.
3. A tag on a child's bag or an older relative's keys. Coin cell, because you can replace it during a normal visit rather than asking somebody else to remember a cable.

Whichever you pick, the battery is not the deciding feature of a tracker. The network it reports to is, which is the argument we made at length in are item trackers worth it.

How Homing Tag helps

Homing Tag is a coin cell design, chosen so that the maintenance is a battery you can buy anywhere rather than a cable you have to keep.

It runs on a single CR2032 for up to two years, and changing it is a twist of the cover. The body is a 36.3 mm square, 9 mm thick, adding roughly 10 g to whatever it hangs from. An IP67 rating means rain, a spilled drink and a dropped puddle are not events.

It works through Apple Find My using the app already on an iPhone, needs iOS 14.5 or later, and cannot be paired with an Android phone. Play Sound rings it at 80 to 100 dB inside a Bluetooth range of up to 60 m, and beyond that the Apple devices of people walking past relay anonymous sightings that are encrypted end to end. Item sharing works on iOS 17 and later, left-behind alerts work, and Apple's unwanted tracking alerts are supported.

They come two to a box, with free UK delivery and 30 day returns. Look at the two pack.