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  How much is a replacement battery for a BMW i3? 12 Jun 2023 (Ask HJ)
  How much is a replacement main battery for a range extender BMW i3 on a 66 plate?
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  My car occasionally won't start - is it time for a new battery? 24 Apr 2023 (Ask HJ)
  My 2016 Nissan X-Trail occasionally won't start The battery shows 11.8v and the dash lights up but the car only clicks when the ignition key is turned,...
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  Why is my car slow to start in the winter? 28 Dec 2022 (Ask HJ)
  Why does my 2018 BMW 120D Sport (with 21,000 miles) seem hesitant to start on icy cold mornings?
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  What trickle charger do I need to prevent a flat battery? 7 Jan 2021 (Ask HJ)
  What type of battery charger do I need for my BMW 218 Tourer? It's not being used much and the flat battery light keeps appearing.
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  What is the best way to maintain PHEV batteries and enable them to keep their charge? 13 Mar 2019 (Ask HJ)
  What is the best way to maintain PHEV batteries and enable them to keep their charge?
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  Why is the battery in the Toyota GT86 so small? 8 Jan 2016 (Ask HJ)
  I have complained to Toyota about my GT86 not starting due to a battery flat. The problem has caused me to lose complete confidence in the car. They have...
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  Will a USB stick drain my car's battery? 10 Feb 2015 (Ask HJ)
  Does leaving a USB stick connected and/or a phone charger discharge the battery? My wife's Honda CR- has just done a 100 mile journey, yet a few days later...
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  Is it possible to disconnect a battery isolator without sounding the alarm on my Rover 45? 21 Dec 2013 (Ask HJ)
  I keep a 10-year-old Rover 45 garaged abroad. I have fitted a simple battery isolator, and even after five months away it still starts first time on reconnection....
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  Can you charge a battery off-car using jump leads? 17 Jan 2012 (Ask HJ)
  Can you charge a battery by connecting it to another car by jump leads?
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  Can anyone change a Jaguar F-Type battery? 16 Jan 2023 (Ask HJ)
  I own a 2018 Jaguar F type 3.0 (380) with 14,000 miles on the clock. Recently, I've started to experience battery issues. The car only does 2,000 miles...
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  Why is the RAC charging so much for replacement batteries? 11 Oct 2012 (Ask HJ)
  I phoned the RAC for a quote this morning for a battery for my 2008 BMW 520D Sports Touring. A very pleasant and helpful young lady called Tracy quoted...
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  What is the battery life like on a mild hybrid? 13 Dec 2023 (Ask HJ)
  I am thinking of purchasing a 3 year old Suzuki with mild hybrid but am concerned on the life / replacement cost of the hybrid battery etc. I believe Suzuki...
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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...
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  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...
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  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...
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  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...
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  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...
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  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...
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  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...
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  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...