Why does my Land Rover battery keep going flat?

Either something keeps drawing current after the car is locked, or the battery can no longer hold its charge. We test both before replacing anything.

Will a new battery fix it?

Not if something on the car is draining it. A new battery would go flat again, so we find the source first and only replace the battery if it fails its test.

Why do you need to keep the car to test it?

The draw is measured once the car's control modules have gone to sleep, so the car has to stand locked for a while before the reading means anything.

Can you fit and register a new battery?

Yes. We fit the new battery and register it to the car in-house, once you have given your written approval.

Is there a recall for Land Rover battery drain?

Whether a recall applies depends on the individual car, so check your registration on the gov.uk vehicle recall checker. Recall work is done by the manufacturer's network, not by us.

Land Rover battery drain

Flat battery overnight: tracing parasitic drain

If your Land Rover or Range Rover battery goes flat after standing, we test the battery and measure the current the car draws once its control modules have gone to sleep, to find out where the drain is coming from. We fix the source we find and, if the battery itself needs replacing, fit a new one and register it to the car, with your written approval before any part is fitted.

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Last updated 12 November 2026

Which cars are affected?

This page covers Land Rover and Range Rover models whose battery goes flat after the car has stood, for example overnight. If you are not sure whether your car’s problem is a battery drain, put the registration and what happens in the enquiry form and we will advise.

For other Land Rover and Range Rover work, see our Land Rover and Range Rover specialist page.

What are the symptoms?

a flat battery after the car has stood
warning messages on the dash

When you book, tell us:

how long the car stands before it goes flat
which warning messages you have seen

What causes it?

There are two broad possibilities. Something on the car keeps drawing current after it is locked and should be asleep, which is called parasitic drain. Or the battery itself can no longer hold its charge.

The two can look the same from the driver’s seat, so we test before we decide which it is.

How do you confirm the cause before fitting parts?

A fault code is not a repair, and a flat battery is not a diagnosis. Before we quote for any parts, we:

read the fault data stored in the car’s control units
test the battery
measure the current the car draws once its control modules have gone to sleep

If the draw is too high, we trace the circuit it is coming from. We then show you what we found and send a written price. No part is fitted until you approve it in writing.

What does the repair involve?

We fix the source of the drain that the tests found. If the battery fails its test, we fit a new one and register it to the car.

Once the work is done, we measure the draw again with the car asleep to check the drain has gone.

Do you trace battery drain on Jaguar cars too?

Yes. We carry out the same tests on Jaguar cars, testing the battery and measuring the current the car draws once its control modules have gone to sleep, then fixing the source we find. If the battery fails its test, we fit a new one and register it to the car. Put the registration and what happens in the enquiry form and we will advise. For other Jaguar work, see our Jaguar specialist page.

How long does it take?

It depends on what the tests find. The draw can only be measured once the car’s modules have gone to sleep, so the car needs to stand locked with us for part of the test.

Before any work starts, you get a written price and a promised time for your next update. If the car needs to stay with us, ask about a courtesy car when you book.

Is there a recall for this fault?

Whether a recall applies depends on the individual car, so check your registration on gov.uk. Recall work is done by the manufacturer’s network, not by us.

Reverie Autocare is an independent specialist and is not affiliated with or endorsed by Jaguar Land Rover, Land Rover, Range Rover, Defender, Discovery or Jaguar.

Our promise on every job

Written approval before any extra work
Photographic proof of what we find
A promised update time
No surprise invoice
A test drive and verification where appropriate

Our service centre

Where will my car be looked after?

At our centre at 57 Great North Road, Welwyn Garden City, built so that waiting for your car is not wasted time.

Seven ramps and an on-site MOT bay
Three customer waiting areas
A co-working space with Wi-Fi
A multi-faith prayer room and quiet room
Lavazza coffee
Customer parking

Questions people ask us

Why does my Land Rover battery keep going flat?: Either something keeps drawing current after the car is locked, or the battery can no longer hold its charge. We test both before replacing anything.
Will a new battery fix it?: Not if something on the car is draining it. A new battery would go flat again, so we find the source first and only replace the battery if it fails its test.
Why do you need to keep the car to test it?: The draw is measured once the car's control modules have gone to sleep, so the car has to stand locked for a while before the reading means anything.
Can you fit and register a new battery?: Yes. We fit the new battery and register it to the car in-house, once you have given your written approval.
Is there a recall for Land Rover battery drain?: Whether a recall applies depends on the individual car, so check your registration on the gov.uk vehicle recall checker. Recall work is done by the manufacturer's network, not by us.