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3rd January 2019, 18:45 | #1 |
Avid contributor
75 Contemporary SE 2.5 V6 Auto, Rover 45, classic mini and E Niro Join Date: Oct 2012
Location: Ballymena, Northern Ireland
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Battery banjaxed?
My V6 has been sitting unused for about a month. When I went to open it tonight the battery was so discharged that I had to use the key to open the door. I attached a 'smart' charger to the battery and it was registering at 4.7 v. I then noticed a regular clicking noise from the fusebox - probably a relay. Any ideas what's causing this? Is it safe to attach a 'fast' charger? I hate to admit it but I suspect the battery is toast!!
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3rd January 2019, 18:57 | #2 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
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Disconnect the battery and charge it for 24 hrs and you'll probably find the clicking noise has vanished (low voltage).
Depending on the age of the battery you should be able to get life back in it. I recently bought a spares or repair which had stood 3 years with a flat battery, charged / discharged a few times, now back in service. Regards |
4th January 2019, 21:02 | #3 |
This is my second home
R75 Saloon. Join Date: Feb 2009
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How's your V6. Did you get it running after the battery charge ???
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4th January 2019, 21:57 | #4 |
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75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007
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If the battery was completely flat then a "smart" charger often will not charge it, it will think it's 6v and charge it to that
To charge a completely flat battery you need a normal battery charger and put it on for a couple of hours then swap over to the "smart" charger Russ
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4th January 2019, 23:33 | #5 |
Been round the block
75 Tourer Join Date: Apr 2009
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Banjaxed, like it.
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6th January 2019, 18:30 | #6 |
This is my second home
R75 Saloon. Join Date: Feb 2009
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6th January 2019, 20:03 | #7 | |
Gets stuck in
MG ZT 190 SE Join Date: Oct 2017
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Quote:
If the battery is that flat then you will need a proper battery charger and it may well take a couple of days to fully charge, unfortunately most modern batteries are sealed so you can't take specific gravity readings - these are the most accurate way of checking the status of charge of a lead-acid battery. I would not use a 'fast' charger, if the battery is very low with a low internal resistance the high current from a boost charger may well damage the battery. |
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6th January 2019, 20:52 | #8 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
Location: France/or Devon.
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Quote:
You can't Assume it was fully charged or anything really.---- |
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7th January 2019, 23:07 | #9 | |
I really should get out more.......
Vauxhall Insignia CDTi; MG TF 135 Join Date: Jan 2010
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It's Irish, but of uncertain origin...
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Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes. |
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