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• 
  car not used for long periods 10 Nov 2010 (Ask HJ)
  As I go away for long periods, 3 months sometimes, what is the best way to stop the battery from totally discharging. Should it be disconnected or are...
• 
  Why has my Renault Megane's immobiliser stopped working? 27 Jul 2010 (Ask HJ)
  My 1998 Renault Megane's immobiliser is not working. I can't start my car. It's not my fob as I've just put new batteries in. Can you help?
• Peugeot 205 (1983 - 1997) - 94 1.1 Major Battery malfunction 27 Nov 2009 (Forum)
  I have never had this problem with any of my cars, so it has puzzled me I recently took the old battery out of my 205 as it was dead, and replaced it with a brand new one, the problem came when I connected the negative lead to the battery... as soon as I did, a crackling sound came from the front left of the engine bay, then smoke started coming out of the part that is on the right hand side that had a belt around it and what looks to be a fan inside the casing I have no idea what the part is called, but it is the only thing connected to the radiator with a belt on that side of the engine Bay
• Mazda Mazda 6 (2002 - 2007) - 05 2.0 Won't start - battery problems ? 25 Jul 2009 (Forum)
  I now get virtually no response at all, except for some of the dials sweeping. When a similar thing happened to my Focus it turned out to be a duff battery - I've just checked the battery in the 6 and it's reading 11.89V - shouldn't that be enough ? The central locking seems to be working so that hasn't got sluggish yet. The dials illuminate, but it's not possible to get the stereo on.
• Jeep Grand Cherokee (1994 - 1999) - 1996 4L Battery drain 9 Feb 2009 (Forum)
  Can anyone advise what could be the problem? My 1996 Jeep Grand Cherokee ( 4 L Petrol)has an intermittent fault (battery drain) If I leave the Jeep over night it has a dead battery in the morning. I have identified the circuit to the A/C heater blower circuit because when I remove the 40 amp fuse there is no problem.
• BMW 3-Series E46 (1998 - 2005) - 04 320d Car start Battery removal/charging/jumping 19 Nov 2008 (Forum)
  I have been let down by my warranty providers as I didn't address it within 14days reporting it. Thinking it is the battery, if so does someone know where the battery is to remove it to charge it? or where it is so that I can try to jump start it with leads? If anyone thinks it might be something else then please suggest Many thanks and sorry for my ignorance!
• Cold cranking amps = amp/hour capacity? 16 Dec 2007 (Forum)
  I'm in the process of trying to buy a battery. I want an ordinary car battery of 85-90 Amp/hours but the sales people I speak to on the phone talk of Cold Cranking Amps (CCA) which is a unit I'm not familiar with. From the Internet I know that CCA is "is the number of amps the battery can deliver at 0° Fahrenheit for 30 seconds, while maintaining a voltage of at least 7.2 volts, for a 12 volt battery".
• Mercedes Benz E-Class W210 (1995 - 2002) - 1995 E320 Alarm problem after fob battery swap. 20 Oct 2007 (Forum)
  Any thoughts gratefully received please. Before you say go back to the "changer of the battery", this will not be a prob', but I am so wishing to solve it now. Very best regards..........Martin.
• Ford Escort (1990 - 1992) - Early Mk5, 1.3HCS - Battery light stays on. 16 Sep 2007 (Forum)
  I am now having to disconnect the alternator overnight so as not to drain the battery, which is a great inconvenience. Does anybody have any idea why this has started happening? Any help greatly appreciated. Martin
• New car battery run down - Ford Focus 14 Apr 2007 (Forum)
  HI I bought a new ford focus a few weeks ago .. ,When I went to view the car( before I paid for it) the car the battery was flat but the dealer said they would re charge it for me I was away after that and did not use the car for ten days. Now after a week and ,I must confess, trying to set the sat nav up, with the engine not running the battery is flat again..
• Octavia central locking battery 8 Apr 2007 (Forum)
  I need to check (1). No effect on the TV when I try the remote in front of it. I need to take the battery out, but how? Thanks in advance for your help CD
• vauxhall vectra charging problems 19 Feb 2007 (Forum)
  I have a vauxhall vectra 1998 and when I bought it it had a new battery fitted 3 months previous ,after 6 months running it packed up so bought another new one. this one has lasted 5 months and it finally succummed . when the car is stood with the dead battery the reading across the terminals is 11.5v.... when running the reading goes to 13.7v..... when I dissconnect the teminals from the battery when it is still running the reading across the terminals is still13.7v so the alternator is still giving a reasonable output..... could it be just coincidence that I have had two dud batteries or could it be something else any help would be appreciated Thnx............................
• Replacing Corroded Battery Cable VW Polo 4 Oct 2006 (Forum)
  A new cable costs around £60 so being of the old school I'm wondering is it practical or wise to just cut back the old cable and seal it off and then run another cable from battery to starter bypassing the old one? and save some money.
• BX Charging fault 12 Jul 2001 (Forum)
  They were charging, but were putting out around 16v before they blew. I`ve now put in a new unit, and a new battery, am still getting a 16v reading at the battery. Figures are- ignition off 14v, idle 14.5, Rev it a bit and I`m back to 15,9-16v. I then cut the engine before I burn out this one! I have tried setting the alt. up with a separate battery, isolated from the rest of the car, and get a reading of 14,7v at the battery.
• benz - (Solved) Mercedes Benz E 270 2005 battery drain 15 Sep 2015 (Forum)
  (Illiterate spam removed.)
• car battery - jump starting 24 Aug 2005 (Forum)
  can i jump start a positive earth car with a negitive earth car is there a special way of doing it
• Any - Battery Care 23 May 2021 (Forum)
  How many minutes of running does an average modern car take to replenish the electrical energy taken from the battery to start its petrol engine from cold? I remember hearing in the past that it took at least 15 minutes, but that was a very long time ago and cars back then didn't have all the electrical accessories and gadgets that they have these days.
• Jeep Grand Cherokee 2014 - Siren Alarm Battery Fault 14 Sep 2019 (Forum)
  Hi Everyone! I was wondering if anyone knows where the siren alarm battery is on my 2014 Jeep Grand Cherokee? It is appearing with a fault on the ECU and also won’t let me lock the car as after it’s set it automatically starts sounding! Any ideas would be much appreciated!
• Vw touran - Touran battery light problem 10 Feb 2017 (Forum)
  The battery light comes on when I am above 3000revs but goes off again if I drop below. There is also a whirring sort of sound when I accelerate or rev the car but the acceleration is as normal. I'm wondering if this could be the belt slipping or badly worn making the noise and the light come on or possibly the clutch pulley on the alternator.
• 2000 (W) 1.2 Corsa - Vauxhall Corsa won't start 8 Sep 2010 (Forum)
  All 'normal' lights lit on dashboard, turn key and all we get is a clicking sound from engine. Took battery out and re-charged - no effect, still won't start. Battery is original in car - 10 years old, although still has green marker showing on top of battery. Any ideas ?