Showing results in  Ask HJ [Show all channels]

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  Do you need to register a new battery with the car's on board computer? 6 Mar 2025 (Ask HJ)
  Why does one need to 'register' a replacement battery with the on board car's computer?
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  Can a battery be trickle charged without removing the battery cables? 24 Dec 2010 (Ask HJ)
  Can a battery be trickle charged without removing the battery cables?
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  Why does my BMW have two batteries? 12 Mar 2025 (Ask HJ)
  There are two batteries in a my BMW 330e 2017, excluding the high voltage battery. One auxiliary battery under the bonnet and another battery in the boot....
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  Electric cars - is it best to own or lease the battery? 16 Aug 2021 (Ask HJ)
  If buying an electric car, is it best to own or lease the battery?
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  Does a charger keep both batteries topped up in a hybrid? 11 Apr 2020 (Ask HJ)
  Will a charger keep the hybrid battery and the starter battery topped up in my Toyota Yaris Hybrid?
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  Changing a battery on a 3 Series - Do I have to use an approved battery? 6 Jan 2016 (Ask HJ)
  The battery on my 2007 BMW 325i is no longer holding a charge properly. With previous cars I've changed the battery myself. However having looked at various...
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  How long should a key fob battery last? 18 Dec 2020 (Ask HJ)
  How long should a key fob battery last? I have had five new sets of key batteries in 2.5 years. Is this normal?
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  Flat battery - what's the cause? 13 May 2014 (Ask HJ)
  Why does the battery on my Peugeot 306 go flat when the car is left with nothing running? The battery has been checked and it's fine.
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  Ford Focus battery problems 14 Sep 2015 (Ask HJ)
  I just changed my alternator because it wasn't charging my battery. The problem is my battery light is still on, check battery showing healthy 12.5v it...
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  Is it safe to charge a battery using a standard non-smart battery charger without disconnecting the battery? 28 Feb 2020 (Ask HJ)
  My wife's Suzuki Vitara petrol is only used for occasional short trips and the battery is running low on charge. Can I charge it in situ using a standard...
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  Buying an electric car - can I have the battery tested? 29 Oct 2016 (Ask HJ)
  I want to buy a second hand Nissan Leaf. Do you know of companies that can do a professional test of its battery and issue a report on its condition?
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  What is better for a flat battery, a booster or charger? 1 Sep 2020 (Ask HJ)
  What is better, battery booster or charger for a flat battery? Can you explain the difference, please?
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  Will removing the battery stop the radio working? 19 Jan 2013 (Ask HJ)
  Can I remove the battery without having to put the code back in for the radio to work?
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  Will a solar charger replenish my car batter? 1 Sep 2014 (Ask HJ)
  Because I do short journeys and low milage, my battery often needs charging. Would a solar charger help to keep the battery charged sand if so could...
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  Battery charging advice 17 Feb 2013 (Ask HJ)
  Assuming I connect the charger correctly, is it safe to charge the battery in my Honda Civic without removing it from the vehicle? I have a modern CTEK...
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  How do I charge the battery on a new Transit Custom? 1 Jun 2018 (Ask HJ)
  The battery on the current Ford Transit Custom is under the drivers seat (awkward). Can you connect a battery charger to the under bonnet connection point...
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  My key battery has died? 17 Aug 2013 (Ask HJ)
  My battery in my key has gone flat. Do I need a new key or can I just get the battery changed? Also would I have to do this at the dealer or are other...
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  Storing a car - Should I disconnect the battery? 12 Oct 2014 (Ask HJ)
  I understand that you should use a float charger to prevent over-charging of the battery. My question is, if I don't use my 1995 Honda Civic for three...
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  Sealed car batteries 7 Jan 2011 (Ask HJ)
  Why would a sealed car battery not hold charge over a period of two weeks?
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  Do I really need to disconnect my battery before charging it? 28 Sep 2013 (Ask HJ)
  The instructions that came with the battery charger I bought from Argos yesterday say 'disconnect the battery from the vehicle before charging, to avoid...