The quick answer
Keep potentially useful keys for assessment first. Unwanted electronic fobs and their batteries belong in appropriate collection schemes, not household rubbish. Check your council’s instructions for metal keys and small electrical items.
1. Check whether the key is needed before discarding it
Keep a damaged original available until a repair or replacement has been assessed. Its condition and components may help explain the problem. Tell the technician whether it still unlocks or starts the vehicle, rather than assuming a damaged case means the whole key is useless.
If the key is for a vehicle you still own, ask whether any security work is appropriate before it leaves your possession. Removing the battery is not proof that a blade or electronic component can no longer be used.
- Confirm that any replacement works as agreed.
- Remove personal address or vehicle labels from unwanted key rings.
- Do not post photographs of key blades or vehicle documents publicly.
2. Separate a removable battery using the correct instructions
Follow the key manufacturer’s opening instructions only if the battery is designed to be removed safely. There is no universal battery type or opening method. If the key is sealed, swollen, badly damaged or difficult to open, seek collection-point advice instead of forcing it apart.
GOV.UK identifies button batteries as portable batteries that can use suitable battery collection points. Keep loose cells away from children, and follow the collection scheme’s instructions for preparing them.
3. Use the correct local collection route
Electronic fobs should go through an appropriate small-electrical recycling route. GOV.UK says unwanted batteries and electrical products should not go into household rubbish. Where a battery cannot be removed, the complete item needs the relevant electrical collection route.
Check your council or recycling centre before travelling, especially for a plain metal key or a fob containing mixed materials. Surrey’s recycling guidance provides postcode-specific advice because collection arrangements vary. Use the equivalent local guidance for your London, Slough or Reading address.
4. Confirm any reuse or take-back arrangement directly
A second-hand fob is not automatically suitable for another vehicle. Do not assume a resale listing means that its electronic parts can be reused or that a buyer will take responsibility for your vehicle’s security.
Ask a retailer, repairer or collection operator what it accepts before handing an item over. Confirm any payment or collection arrangement directly. If you are unsure whether to repair or replace your current key, contact us with the vehicle details and describe its condition first.
Common questions
Can I put an electronic fob in household rubbish?
Use an appropriate electrical-waste collection route. Keep removable batteries separate where the scheme instructs you to do so.
Should every car key go in metal recycling?
No. A key can include electronics even when it looks mostly mechanical. Check the item and the collection operator’s accepted materials.
Must I open a sealed fob to remove its battery?
Do not force or dismantle a sealed or damaged unit. Ask the collection point how it accepts that item.
Can any old fob be sold for reuse?
No universal reuse rule applies. Confirm suitability with the intended recipient and resolve any vehicle-security concerns before handing it over.
Sources and further reading
These sources support the general guidance. For vehicle operating instructions, use the handbook for your exact model and year.