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Do I need to disconnect a car battery before charging it? 4 Jun 2021 (Ask HJ)
You've previously advised readers to disconnect batteries before charging them, in order to avoid damage to the electrics. However, I have, on a number... -
What is the long term life of EV batteries? 1 Oct 2019 (Ask HJ)
I am selling my Audi A4 Allroad 3.0 TDI and am trying to decide upon either a hybrid or EV. Is there any data available on the rate of decline in performance... -
Does an the alternator only keeps a battery to its existing charge level? 5 Jun 2017 (Ask HJ)
I read a recent reply of yours to a Honda CR-V owner whose stop/start isn't working, where you advised a new battery. We recently bought a 2013 CR-V with... -
I was misled about the mpg and battery range on my BMW hybrid - how should I proceed? 16 May 2017 (Ask HJ)
BMW quote up to 148mpg, battery mileage up to 25 miles for my BMW 330e. I can only attain 58 mpg and battery range between 6.8 and 12 miles. I feel I have... -
Why won't my BMW 320i start? 7 Nov 2016 (Ask HJ)
I have had a BMW 320i for about three months and during this time it has developed an intermittent starting fault. Basically, about every fourth time I... -
Battery being drained 14 Oct 2011 (Ask HJ)
The battery on my Renault Megane is being drained, and mechanics confirmed that there were no faults with the car or battery. Could the problem be due... -
What happens to a leased battery if an electric car is written off? 27 Dec 2017 (Ask HJ)
We bought our 2015 Renault Zoe outright from a Renault dealer a couple of months ago, but we have to lease the batteries from Renault. I was having a discussion... -
Why does my Volvo S80's battery keep going flat? 26 Oct 2013 (Ask HJ)
This is a desperate call for help. My car is a Volvo S80 auto, bought secondhand with 60,000 miles registered, five years ago. It now registers 67,000... -
Is it possible that the battery in the boot of my Audi A6 is causing my son to suffer headaches? 5 Sep 2010 (Ask HJ)
I have a 2007 Audi A6 1.9TDi saloon. My son sits in the back seat behind the driver and has complained of headaches after having been in the car for prolonged... -
Does the top speed of an electric car drop when the battery is low? 23 May 2023 (Ask HJ)
The top speed of my electric bike drops slightly when the battery charge is low. Does the same thing happen with electric cars? -
How do you start a car with a dead battery? 19 Mar 2018 (Ask HJ)
My mate's Rover 75 won't start. It keeps making a clicking sound when he turns the key and his battery has gone completely flat. It wont start and you... -
Why is the battery always flat in my Peugeot 307? 8 Feb 2015 (Ask HJ)
Our Peugeot 307 (2007 registration) suffers from a flat battery in the mornings. I've tried buying a new battery, but they have also gone flat. The... -
Can you jump-start a car from the cigarette lighter? 3 Oct 2012 (Ask HJ)
I have some questions for you about the use of jump leads. I have seen an advertisement that states you can plug them into the cigarette lighter socket... -
I've changed the battery in the key fob - why won't the car unlock? 6 Dec 2021 (Ask HJ)
I changed my battery in the key fob as a warning came up to change the battery. Now the car won't unlock, why is that? -
Car battery Ah rating 6 Dec 2012 (Ask HJ)
Having had a battery replaced less than two years ago (due to a roadside breakdown), the new one has also failed. The one that was fitted at the roadside... -
Is Rover or battery maker Delphi responsible for battery failure after nine years? 23 Aug 2011 (Ask HJ)
Does this win the prize for the most optimistic claim for product failure? Last week my dealer-maintained Rover 75's original manufacturer-fitted battery... -
Ford Fiesta battery 3 Jan 2011 (Ask HJ)
I am having a lot of problems with the battery on my R-reg Ford Fiesta Auto - they keep dying! Four in less than four years each replaced by the AA under... -
Why is the battery always flat on my Citroen Berlingo? 21 Dec 2022 (Ask HJ)
In June 2021 we bought a Citroen Berlingo, which had been adapted for wheelchair access, from a specialist dealer. The vehicle is used only for short runs... -
How far do I need to drive my car to charge its battery? 17 Nov 2020 (Ask HJ)
My husband has a 2017 Ford Kuga automatic with i-stop but won't be able to drive it for 6 months. How far do I need to drive it to charge its battery?... -
What's causing my Ford Kuga's flat battery? 13 Dec 2016 (Ask HJ)
I have a 2012 Ford Kuga diesel. Recently, the battery has started to go flat every 10-14 days if its stood on the driveway or only used a couple of times...
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