Aston Martin DB11 Owner's Handbook Manual page 30

Battery Replacement
To replace the vehicle key's battery:
1. Lift the battery cover (A).
2.4
Vehicle Security
2. Push down on the battery to tilt the battery (B) and allow
access.
3. Remove the battery and install the new battery with the (+)
sign facing up.
4. Replace the battery cover.
Keyless Start Failure
If the vehicle does not start because the charge in the vehicle key
battery is too low, use the emergency start procedure (Refer to
'Emergency Engine Start', page 2.13).