Motorcycle Key Fob Battery Replacement by Make

Quick answerMost motorcycle key fobs run on a single 3 volt coin cell. Honda, Ducati, KTM, BMW, Harley-Davidson and Indian fobs take a CR2032, and the Kawasaki Concours 14 fob takes a CR2025. Each make warns you differently when the cell is weak, from five flashes of an indicator on a Honda to a dash message on a BMW. Every system also has a documented backup for a flat fob, so a dead battery should not strand you if you know where your backup key, card or PIN is.

Battery type and warning by make

The table lists what each maker's manual says for its keyless models. Battery types can change between generations, so read the marking on the old cell or check your manual before buying. Yamaha and Triumph smart keys also run on a coin cell, and their manuals give the type for each model.

System	Battery	Backup if the fob battery is flat
Harley-Davidson hands-free fob	CR2032; the owner's manuals say to replace it every year	Your five-digit PIN
Indian key fob	CR2032; Indian recommends changing it yearly	Your rider PIN
Ducati Hands Free active key	CR2032	The active key still reads at close range like the passive key; the passive key; a PIN if you stored one
BMW Keyless Ride	CR 2032	The emergency key, detected electronically at the ring antenna
Honda Smart Key	CR2032; Honda says it normally lasts about 2 years	The emergency key and the ID number on the ID tag
Kawasaki KIPASS (Concours 14)	CR2025	A documented flat-battery backup, plus the mechanical emergency key inside the fob
KTM RACE-ON key	CR 2032	The key can still be read at the antenna; a black ignition key or, on later models, a RACE ON chip is the backup

How long a fob battery lasts

The manuals give a range, not one number. Honda says the Smart Key battery normally lasts about 2 years. Indian's 2022 Chief manual says about 2 years but recommends changing it yearly, and adds that two-button fobs run down faster when the lock and unlock buttons are used often. Harley-Davidson's owner's manuals say to replace the fob battery every year, and Kawasaki's KIPASS manuals give about a year.

Cold shortens that. Indian tells riders to keep the fob above 45 degrees Fahrenheit in cold weather, and KTM gives a permissible range of minus 20 to 50 degrees Celsius for the key. A simple habit is to replace the cell on a fixed date each year, before a long trip season, without waiting for a warning.

What the warnings look like

Honda's signal is easy to miss if you do not know it: the Smart Key indicator flashes five times when the electrical system is turned on, and Honda says to replace the battery as soon as possible if that happens or if the operating range becomes unstable.

BMW's rider's manual describes a yellow warning with a key battery message, and explains that the battery has lost a significant proportion of its capacity and there is no assurance of how long the key will keep working. If the warning for a flat or missing key appears while riding, BMW says to remain calm: you can continue your journey and the engine will not switch off.

Indian lists four signs: reduced authentication range, the horn honking five seconds after startup, the security light staying on for up to 20 seconds, and the battery and security lights on together. KTM notes that the 1.5 meter range of the RACE-ON key shrinks as the key's battery voltage drops. Ducati shows a message on the dashboard, and some Kawasaki KIPASS models show a low fob battery warning on the display.

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Changing the cell without causing a new problem

A battery change does not unpair a fob on the systems where the maker says so in writing. Ducati's manual for the Diavel states that the keys do not need to be reprogrammed after replacing the battery. Follow your own manual for how the case opens, because that is where fobs get damaged.

Take out the mechanical key first where the fob has one. Indian's courtesy key and KTM's fold-out key bit both come out or fold out before the case opens.
Open the case only at the marked point. Ducati warns that a tool in the wrong place can damage the circuit board or the protective gasket, and says not to force the battery or its holder.
Match the orientation. KTM says the new battery goes in with the label facing upward; Honda and Harley-Davidson also specify which side faces up.
Use the same type. Honda warns of a danger of explosion if the battery is incorrectly replaced, and Ducati says to use only a battery with the same code and electrical characteristics.
Do not touch the circuit or terminals. Honda says only the cover should come off and recommends having a dealer do the job if you are unsure.
Close the case fully. KTM says not to use the key if the battery compartment cannot be closed.

Coin cells and children

The manuals carry the same warning. KTM states that swallowing a button cell leads to severe chemical burning and may result in death in under 2 hours, and Indian says severe burns can occur within 2 hours. Keep new and used cells, and the fob itself, out of reach of children, and seek medical attention immediately if one is swallowed.

If a new battery does not fix it

Check the simple things: the right cell, the right way up and the case snapped shut. If the bike still does not see the fob, our guide to a keyless motorcycle not detecting the key covers interference and the other causes. If it starts with the backup key, PIN or code but never with the fob, the fob itself has probably failed and needs replacing and pairing. We program fobs and transponder keys for the makes and years our equipment covers, at the bike, with photo ID and registration or title. Harley-Davidson and Indian fobs are paired through their dealers.

Quick questions

Do I have to reprogram my motorcycle fob after a battery change?

Normally no. Ducati states the keys do not need to be reprogrammed after replacing the battery, and Indian says the same about re-syncing. If the fob stops working afterward, check the cell type and orientation first.

What battery does my motorcycle key fob take?

Honda Smart Key, Ducati Hands Free, KTM RACE-ON, BMW Keyless Ride, Harley-Davidson and Indian fobs take a CR2032, and the Kawasaki Concours 14 fob takes a CR2025. For other makes, read the code on the old cell or check the owner's manual.

Can I still ride if the fob battery dies on the road?

Usually, if you prepared. Each system has a backup such as a PIN, an emergency code card or an emergency key. Find yours in the manual and keep the PIN or code somewhere other than on the bike.

How do I know the fob battery is low before it fails?

Shorter range is the common early sign. Honda adds five flashes of the Smart Key indicator at switch-on, BMW shows a dash warning, and Indian's horn honks five seconds after startup.

Services that can help

Key details by make

Keep reading

Keyless Motorcycle Not Detecting the Key: Causes and BackupsOwner's manuals give a short list of reasons a keyless bike fails to detect its fob: a weak fob battery, the fob carried against a phone, laptop or metal object, strong radio interference nearby, the fob switched off or out of range, and a low battery on the bike itself.
Water Damaged or Broken Motorcycle Key Fob: Repair or ReplaceA damaged fob is often less dead than it looks.
Motorcycle Key Fob and Keyless Ignition ProblemsMost keyless motorcycle problems come down to a weak fob battery, a fob the bike is not reading, a damaged fob or a lost one.
Motorcycle Key Turns but the Bike Won't Start: Key or Not?Watch the immobilizer or key light in the first seconds after you switch on.

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Page last updated November 14, 2026.