These instructions apply to the Land Rover Discovery Sport Mk1 (L550) 2015-Present.
For other models, please choose your vehicle here.
Disconnecting the 12 V battery on your Land Rover Discovery Sport (2015–present) is a DIY job most owners can manage — usually to fit a new battery, lay the car up for storage, or make things safe before working near the airbags. The one thing to understand first is that the Discovery Sport runs a battery monitoring system (BMS) that tracks the battery’s condition and manages charging, so fitting a battery here takes a little more than on an older car. Follow the sequence below and the car relearns cleanly, with most items settling over the first few drives.
Where the 12 V Battery Is
The 12 V battery is under the bonnet, in the engine bay, behind a cover. Lift the cover and you will see the battery with a small battery monitoring connector on the negative side — that is the BMS sensor, and it must go back exactly as it came off. Before you touch anything, identify the two posts: the negative (−) terminal takes the black earth lead (with the BMS connector), and the positive (+) terminal takes the red lead and usually sits under a red or orange cap. Confirming which is which now removes any risk of shorting a spanner across them.
Before You Start
- Switch the ignition fully off, take the key out of range of the car and close the doors so nothing wakes the electronics.
- Make sure the lights, climate, radio and any accessories are all switched off.
- Note down your radio presets, any security code and personal settings so you can restore them.
- Let the car sit for a couple of minutes after switch-off so the modules power down.
- Have the right spanner to hand, and wear gloves and eye protection when working around the battery.
Disconnecting the Battery
- Confirm the ignition is off and every electrical consumer is switched off.
- Unclip and lift the battery cover.
- Loosen the clamp on the negative (−) terminal first — taking care with the BMS connector on that side — lift the lead clear and tuck it aside so it cannot spring back.
- Now loosen and remove the positive (+) lead.
- If you are working near the airbags or seat-belt pretensioners, allow a minute or two after disconnecting before you begin, so those circuits discharge.
Reconnecting
- Reconnect the positive (+) terminal first and tighten it.
- Reconnect the negative (−) terminal last and refit the battery monitoring system (BMS) connector, then tighten the clamp.
- Check both clamps and the BMS connector are secure, switch the ignition on and re-initialise the power windows (one-touch is lost), then re-enter the clock and settings.
Fitting a new or different battery? The BMS ideally needs resetting or registering with Land Rover diagnostic equipment so it recognises the new battery and charges it correctly. A like-for-like swap usually settles after a few drives, but the BMS reset is the proper step — and is often why stop/start stays inactive for a while afterwards.
What You’ll Need to Reset Afterwards
- Power windows — the one-touch up/down is lost, so re-initialise each window by holding it fully up and fully down.
- Clock, radio presets and personal settings — re-enter these from the display.
- Battery-management / stop-start — the BMS relearns the battery state over the next drives, and stop/start may stay inactive until it does.
- A few warning lights may appear on first start and self-clear once the systems settle over a short drive.
If Something Isn’t Right Afterwards
- Recheck both terminals and the BMS connector are clean and firmly seated — the most common cause of trouble after reconnecting.
- Windows won’t auto-close — simply run the window re-initialisation again.
- Stop/start inactive afterwards is usually the BMS still learning the battery state; give it a few drives.
- Rule out a genuinely flat or worn battery — if it will not hold charge, the battery is the problem, not the reconnection.
- Any warning light that stays on has stored a code you can decode on autodtcs.com.
Frequently Asked Questions
Where is the 12 V battery on a Discovery Sport?
Under the bonnet, in the engine bay, behind a cover. The battery monitoring sensor is attached on the negative side and must be refitted when you reconnect.
Which terminal do I disconnect first?
The negative (−) terminal first when disconnecting, and reconnect it last. On reconnection the positive (+) goes on first, negative last.
Do I need to register a new battery?
Ideally yes — the BMS should be reset or registered with Land Rover diagnostic equipment so it recognises and charges a new battery correctly. A like-for-like battery usually settles over a few drives, but the reset is the proper step.
What needs resetting after reconnecting?
The power windows re-initialise, the clock and presets are re-entered, and the BMS relearns the battery state — which is why stop/start may be inactive for a while.
Will disconnecting the battery clear fault codes or the service light?
It may clear some temporary codes, but it is not a reliable way to reset the service reminder, and a genuine fault simply stores its code again. Fix the underlying cause rather than relying on a disconnect.
Can I jump-start the Discovery Sport instead of disconnecting it?
If the battery is only flat, a jump-start recovers the car and keeps your settings. Disconnecting is the right move for a renewal, storage, or working near the airbags.
If a warning light stays on after reconnecting the battery, look up the stored code on autodtcs.com.
Independent guide — not affiliated with Land Rover. Always follow your official service manual and safety precautions. Read our full disclaimer.