The chart compares diameter and thickness. It does not replace the stamp. The cell usually fitted is the code stamped on the old cell, and the key is a smart key, flip key, or remote-head key. People who searched toyota key fob battery size chart still have one rule to follow. The printed stamp on the old cell wins over a photo of a different year.
Read the stamp before a size comparison
The coin already in the shell is the buying guide for a size comparison.
CR1632 is reported for a size comparison on some mid-generation smart keys, including certain Prius shells.
The CR2016 you might buy for a size comparison is 20 mm across and 1.6 mm thick.
Every one of those coins, in the case of a size comparison, is a 3-volt lithium cell.
A rechargeable LIR2032 does not belong in the shell for a size comparison.
A mark molded into the plastic wins over habit during a size comparison.
Right-hand drive does not change the coin you buy for a size comparison.
Touching a dead smart key to the start button is a separate backup, not the shopping step in a size comparison.
Close the cover fully before you test a size comparison from outside the car.
A brochure can list two keys for one car, and a size comparison still follows the shell you are holding.
If the shell in a size comparison is a new undocumented shape, the pry method is not confirmed.
CR2032: 20 mm across, 3.2 mm thick, 3 volts.
CR1616: 16 mm across, 1.6 mm thick, 3 volts.
Match the cell for a size comparison
A push-button smart key from the 2010s onward usually takes a CR2032 when you are doing a size comparison.
If two reliable notes disagree about a size comparison, the page says they disagree.
The CR2025 you might buy for a size comparison is 20 mm across and 2.5 mm thick.
Same voltage does not make the coins interchangeable for a size comparison.
Almost every Toyota fob takes one cell, and a size comparison is not a two-cell case.
A battery-only swap for a size comparison does not require programming.
Base grades often kept a metal key after a higher grade moved on, which still matters for a size comparison.
Keep the spare coin for a size comparison in a cool drawer, not on a dashboard.
A gap at the cover, during a size comparison, means the coin is too thick or a clip missed.
Japan, Australia, Europe, and the US can print different grade names around a size comparison.
A bZ4X-style shell is not opened with an older Camry method during a size comparison.
CR2025: 20 mm across, 2.5 mm thick, 3 volts.
Same voltage is why people stack the wrong coins. Thickness and diameter are why they fail.
Keep the wrong parts out of a size comparison
An older remote-head key or flip key usually takes a CR2016 when you are doing a size comparison.
CR1616 is uncommon for a size comparison and is not the default older Toyota cell.
A CR1632 reported for a size comparison is 16 mm across and 3.2 mm thick.
A CR2450 is the wrong coin for a size comparison.
This site does not invent a two-battery fob for a size comparison.
After a size comparison, lock the car once from outside and then unlock it once.
Grade names used for a size comparison belong to that market, not to a borrowed US list.
A pharmacy coin and a dealer coin are the same job for a size comparison when the stamp matches.
Do not stack a second coin as a shortcut for a size comparison.
The work of a size comparison stays a cell swap on a hybrid.
If the stamped coin is seated and a size comparison still fails, the fob has failed. Stop.
CR2016: 20 mm across, 1.6 mm thick, 3 volts.
A 20 mm cell will not sit correctly in a 16 mm well.
Close the shell after a size comparison
CR2025 appears for a size comparison only on some older compact remotes.
The CR2032 you might buy for a size comparison is 20 mm across and 3.2 mm thick.
A CR1616, uncommon for a size comparison, is 16 mm across and 1.6 mm thick.
An A23 battery is the wrong shape for a size comparison.
Plus, while you handle a size comparison, is the flat branded face unless the shell mark disagrees.
A hybrid badge does not change the coin you buy for a size comparison.
A never-paired extra fob is outside a size comparison. A dealer or licensed locksmith does that work.
A date code on the blister for a size comparison tells you the coin is fresh. It does not choose the size.
Do not slip foil under the coin as a shortcut for a size comparison.
The work of a size comparison stays a cell swap on a right-hand-drive car.
Write the stamp on the spare sleeve when you finish a size comparison.
CR1632: 16 mm across, 3.2 mm thick, 3 volts.
A 3.2 mm cell will not close a 1.6 mm well.
Pages that sit beside a size comparison
Continue with Toyota Key Fob CR2032.
Continue with the page Toyota Key Fob CR2016.
Continue with the write-up on Toyota Key Fob CR2025.
Continue with notes for Toyota Key Fob CR1632.
Continue with Toyota Key Fob CR1616.
Questions answered only with the facts above
Which cells share the 20 mm diameter?
CR2032, CR2025, and CR2016. Their thicknesses are 3.2, 2.5, and 1.6 mm.
Which cells are 16 mm across?
CR1632 and CR1616. They are uncommon in Toyota fobs.
Does the chart override the stamp?
No. The stamp on the old cell wins.