AA vs 14500
Similar cylinder size, but AA alkaline is 1.5V and 14500 Li-ion is about 3.7V. That voltage jump can destroy electronics that were only designed for AA.
Last verified Aug 25, 2026
Not interchangeable unless the device explicitly supports 14500.
A 14500 vs AA swap fails on voltage, chemistry, diameter, thickness, capacity. If the door only closes when you force it, or the device works only while you press the cover, you have the wrong cell — not a weak spring you should ignore.
Putting a 14500 into a 1.5V AA device can overvoltage and damage the product. Fire risk rises with poor cells and unprotected packs.
AA and 14500 are easy to mix up in a parts bin, but the outline and electrical class are not the same product. Highlighted rows are the ones that change the purchase: voltage, chemistry, diameter, thickness, capacity.
Read physical fit before capacity. Extra milliamp-hours only help when the holder is built for that cell. A “better” spec in the wrong tray is a mechanical or voltage mismatch, not an upgrade.
If you searched 14500 vs AA, you are on the same comparison with the names reversed. The difference between AA and 14500 batteries is not the word “vs” — it is the specs that do not match after you ignore the similar photos.
AA is 14.5 mm across; 14500 is 14 mm. That gap is enough for one cell to miss the clip entirely or rattle in the other tray. IEC codes put diameter in the first digits for a reason: you cannot sand a coin cell down to fit.
AA is 50.5 mm thick; 14500 is 50 mm. Holders are built for one stack height. The thinner cell loses spring pressure (“works only when I press the cover”). The thicker cell jams the door or bends the clip.
Nominal voltage is not a rounding error here. AA is 1.5 V; 14500 is 3.7 V. The lower-voltage cell will starve a circuit designed for the higher one. The higher-voltage cell can stress or destroy a gadget that expected the lower rail.
Even when the cans look related, AA (Alkaline) and 14500 (LiIon) are different product classes. Capacity, voltage sag, temperature range, and whether the cell can be charged all follow chemistry — not the photo on the listing.
Typical AA capacity is 2000–3000 mAh. 14500 is 600–900 mAh. Runtime only follows that gap inside the correct holder. Extra capacity in the wrong tray does not last longer — it often does not run at all.
1.5V (AA) vs ~3.7V (14500)
14500 requires Li-ion charging/protection practices
Coin and button codes are rulers, not brand slogans. The letters mark chemistry class. The digits encode size. AA measures 14.5 × 50.5 mm; 14500 measures 14 × 50 mm. Once you read the code that way, 14500 vs AA stops looking like a preference and starts looking like a fit check.
Usually no. AA is 14.5 × 50.5 mm at 1.5 V (Alkaline). 14500 is 14 × 50 mm at 3.7 V (LiIon). Those are not the same part.
If the spent cell or tray said 14500, specify that code. Forcing AA can crack a cover, lose contact, or apply the wrong voltage.
Usually no. Going the other way does not fix a diameter, thickness, or voltage miss. 14500 in a AA holder has the same problem with the names flipped.
If you arrived from a 14500 vs AA search, stay on this page. The answer does not change.
Retail packs hide the IEC size behind house codes. AA also appears as LR6, 15A, MIGNON. 14500 also appears as AA-LIION. Those prefixes do not change the outline unless the chemistry letters change (BR, LIR, ML, PR).
You do not need a full datasheet to settle AA vs 14500. You need the stamp, the tray, or a cheap pair of calipers. A store bin labeled only “button cell” or “3V lithium” will not do that work for you.
If the manual never mentions lithium-ion or 14500, do not experiment.
Do not stack cells, grind a can, or use foil as a permanent spacer to fake 14500 with AA. Read the stamp, then the spec table. If the door will not close without force, you have the wrong height or diameter.
Only if the flashlight documentation lists 14500 / Li-ion support. Otherwise no.
Yes. AA vs 14500 and 14500 vs AA are the same pair. Fit, voltage, and chemistry do not change when you flip the order.
Use this guide as a starting point, then confirm voltage, chemistry, and physical size with your device manual or the marking on the old cell.
Reviewed by PlainBattery Technical Review Desk on 2026-08-25. Checked: both model identities and dimensions, voltage and chemistry differences, physical fit, interchangeability conclusion and safety warnings.
Revision record: source citations and field-level review scope added September 11, 2026. See our sources and methodology and corrections policy.
