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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....
• Volkswagen Polo IV (2002-2005) - 02 1.4 buying and fitting a new battery 2 Feb 2010 (Forum)
  The recent cold weather has shown that the battery on my 2002 1.4 tdi Polo is getting a little tired so I am going buy a new one. I want one of good quality so I have checked out my local VW dealer who with fitting wants a total of £150 (£133 + £17) for a 72 amp battery. Halfords want £95 + £5
• Vauxhall Meriva B - Parasitic battery drain 4 Dec 2020 (Forum)
  Hi my Meriva has a battery drain issue that is proving tricky to resolve. The battery and alternator are apparently fine but the battery is being drained when the vehicle is off. It is currently with the garage but they are scratching their heads after checking all the fuses and relays to no avail
• Volvo 440/460 - Exploding battery 2 May 2019 (Forum)
  A battery exploded when being used for jump starting a vehicle. connected correctly and allowed 10 minutes soak time- the system woke up and as key turned to engage starter the battery in the wheelbarrow exploded.  bits of casing flew up to 20 m, acid trapped in wheel barrow. No casualties
• Audi TT 3.2 - Battery losing charge 9 Sep 2014 (Forum)
  Hi, the battery on my Audi TT is losing its charge. I have replaced battery but problem remains. I am charging it everyday driving 5 miles to work and battery is flat again at the end of the day. Car is 2004 (first model) with 60k miles. Can anyone suggest what problem may
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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?
• Fiesta MK4 1998 - Battery charger.. 29 Mar 2010 (Forum)
  Hello there, I have a 1998 ford fiesta mk4 with obviously a 12V battery.   What kind of charger do you recommend I charge this battery with? It will not hold it's charge for longer than a day and I know nothing is draining it down. So i'm going to try to charge it before I
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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...
• battery life 18 Jan 2024 (Forum)
  Is it best to keep a battery on smart charge when the car is not in use to prolong the life, or is it better to just use the vehicle  and cycle the normal charge/run down process? In other words, do lead-acid batteries benefit from being worked?
• how to open 306 bonnet from outside. Battery dead 27 Jun 2013 (Forum)
  Battery dead, cant access car with keys (dont fit locks) is it possible to access the bonnet from outside the car in order to charge battery ?!
• Batteries....another discussion. 1 Oct 2007 (Forum)
  Why is it batteries have never advanced from the lead acid principle when smaller batteries used in the electronic gadgetry have advanced leaps and bounds. They seem to stuck in time!!. And there is bound to a knowledgeable backroomer to shed light on this one.
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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...