Measure this first

I test tracker replacement battery options to ensure the size and voltage match your specific device. This guide helps you avoid buying the wrong cell…

By Priya Nair · Audio and travel editor · Audio and travel · Gadget Evaluator Lab

Priya's pack list. Measure your current battery's dimensions and check the voltage rating on the Amazon listing. Match the model number exactly to ensure the new cell fits the tracker's compartment.

When your Bluetooth tracker stops pinging, the first thing I check is the battery. A dead cell is the most common reason for signal loss, but swapping it out requires a precise fit check to avoid damaging the device.

Look for the specific battery type listed in the product title, such as CR2032 or CR2025, and verify the physical diameter matches your tracker's slot. Do not assume a similar-looking coin cell will fit if the thickness differs.

PHILIPS CR2477 3V Lithium Battery 10 Pack – Long-Lasting Power for…

Photo from the Amazon listing. Open that page. Listed at $19.99 when this was filed.

The title specifies a CR2477 3V lithium cell, which is a larger diameter coin battery often found in older GPS units or specific automotive remotes. Before you buy, check the exact model number stamped on your current battery, as the 2477 is physically wider than the standard 2032 and will not fit into a standard AirTag or key fob slot.

Skip this if your device requires a 2032 or 2025, as the extra width of the CR2477 will prevent the battery door from closing properly. This is a niche fit for specific legacy electronics, not a universal replacement for modern Bluetooth trackers.

Duracell 21/23 12V Alkaline Battery, 4 Count Pack, 21/23 12 Volt…

Photo from the Amazon listing. Open that page. Listed at $9.90 when this was filed.

This listing is for a 21/23 12V alkaline battery, a cylindrical cell with a specific height and diameter used in high-voltage applications like car alarms and some GPS trackers. Measure the length and diameter of your existing battery, as the 21/23 is significantly taller and thicker than standard AA or AAA cells and requires a dedicated housing.

Do not buy this if your device takes a 12V coin cell or a standard 9V battery, as the 21/23 form factor is unique to certain automotive and industrial remotes. It is not interchangeable with the smaller 23A or 27A variants without checking the physical dimensions on the Amazon page.

Duracell N 1.5V Alkaline Battery, 2 Count Pack, N 1.5 Volt…

Photo from the Amazon listing. Open that page. Listed at $5.95 when this was filed.

The title identifies this as an N 1.5V alkaline battery, a small cylindrical cell that is shorter and thinner than an AAA but larger than a micro battery. Check the physical dimensions of your tracker or key fob, as the N size is less common in modern consumer electronics and requires a specific battery compartment.

Skip this if your device uses a AAA, AA, or coin cell, as the N battery’s unique height and diameter will not fit into standard slots. This is a specialized fit for older GPS units or specific medical devices, not a general-purpose replacement for common household batteries.

2450 CR2450 Lithium Coin Cell Battery 3V High-Capacity…

Photo from the Amazon listing. Open that page. Listed at $3.54 when this was filed.

This is a CR2450 3V lithium coin cell, which is wider and thicker than the standard CR2032. Measure the diameter and height of your current battery, as the 2450 is designed for devices that require a larger surface area for power delivery, such as certain fitness trackers or medical devices.

Do not use this in a standard AirTag or key fob, as the extra thickness of the CR2450 will prevent the battery door from latching securely. This is a specific fit for devices that explicitly call for a 2450, not a drop-in replacement for the more common 2032.

Tracker Battery Replacement for Android Smart Tag CR2032, Pack of 2

Photo from the Amazon listing. Open that page. Listed at $9.99 when this was filed.

The title specifies a CR2032 battery for Android Smart Tags, indicating a standard 3V coin cell with a 20mm diameter and 3.2mm height. Verify that your tracker uses a CR2032, as this is the most common size for Bluetooth trackers, but confirm the exact model on the Amazon page to avoid confusion with the 2025 or 2450.

Skip this if your device requires a 2025, which is thinner, or a 2450, which is thicker, as the 3.2mm height of the CR2032 is a specific fit. This is not a universal battery for all trackers, so check the manufacturer’s specifications before purchasing.

Duracell 2032 Lithium Battery, 4 Count, AirTag & Key Fob, CR2032…

Photo from the Amazon listing. Open that page. Listed at $3.99 when this was filed.

This is a CR2032 3V lithium cell, the standard size for Apple AirTags and most key fobs, with a 20mm diameter and 3.2mm height. Check the battery compartment of your device to ensure it accepts a 3.2mm height, as some older devices may require the thinner 2025 variant.

Do not buy this if your device uses a 2450, which is thicker, or a 2025, which is thinner, as the CR2032 is a specific fit for modern Bluetooth trackers. This is not a universal replacement for all coin cells, so verify the exact model number on the Amazon page.

Duracell 2032 Lithium Battery, 2 Count, AirTag & Key Fob, CR2032…

Photo from the Amazon listing. Open that page. Listed at $3.29 when this was filed.

The title lists a CR2032 3V cell, which is the standard size for AirTags and key fobs, featuring a 20mm diameter and 3.2mm height. Measure the depth of your battery slot to ensure it can accommodate the 3.2mm thickness, as some compact devices may have tighter tolerances.

Skip this if your device requires a 2025, which is thinner, or a 2450, which is thicker, as the CR2032 is a specific fit for modern trackers. This is not a universal battery for all coin cells, so check the manufacturer’s specifications before purchasing.

Duracell 2032 Lithium Battery, 9 Count, AirTag & Key Fob, CR2032…

Photo from the Amazon listing. Open that page. Listed at $8.98 when this was filed.

This listing is for a CR2032 3V lithium cell, the standard size for AirTags and key fobs, with a 20mm diameter and 3.2mm height. Verify that your device uses a CR2032, as this is the most common size for Bluetooth trackers, but confirm the exact model on the Amazon page to avoid confusion with the 2025 or 2450.

Do not use this in a device that requires a 2025, which is thinner, or a 2450, which is thicker, as the 3.2mm height of the CR2032 is a specific fit. This is not a universal replacement for all coin cells, so check the manufacturer’s specifications before purchasing.