gostin
Part of things
Posts: 84 
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Jun 17, 2018 13:35:33 GMT
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Went to start the car yesterday after a week of not being used and it was totally dead.
it jump started pretty much straight away so I took it a run and left it ticking over for a hour. Went back to it today and dead again.
When I have it running there is a reading of 13.7 across the battery but when I turn it off it drops to 12.4 and then I can watch as it drops voltage every 10 seconds or so.
I have everything switched off on the car so unsure if it's the battery that's done as I don't see anything that's on to drain the battery.
Does anyone have any input? Cheers in advance.
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L300 and wrangler yj.
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Jun 17, 2018 14:45:37 GMT
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get it running again, then once voltage is up again switch it off, then disconnect battery, use multimeter to check battery. if still dropping rapidly its battery. if holding voltage, points at a drain on car.
how old is battery? sounds like a cell gone down.
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Jun 17, 2018 15:24:44 GMT
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If possible check the cells, one dry cell will drop a battery faster than a politicians promise.
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Needs a bigger hammer mate.......
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gostin
Part of things
Posts: 84
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Jun 17, 2018 18:32:28 GMT
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Yeah it’s dropping rapid. New battery needed then, thanks for the info.
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L300 and wrangler yj.
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Is my battery dead?ChasR
@chasr
Club Retro Rides Member 170
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Despite the old wives tales, recharging the battery correctly via a charger is about the only way to truly charge a battery. I've got away with running the car about previously but on most occasions the battery has been fine once recharged on a trickle charger. Driving the car around even for some time will put a 'surface charge' on the battery 8 times out of ten. This will give the impression of a battery being fully charged temporarily but that surface charge will tend not to last. I even have two examples: -74 Stag; Car went flat at the garage. Due to the 'box fault the car ran for an hour, with the battery charging at 14V. I went to get the car a week later. It was flat. When I stalled it at the roundabout it was truly flat! -'85 Escort RST; I left the fans on and killed the battery. Likewise it seemed to have recovered despite dricing the car all weekend, and charging at 14V. 2 Weeks later the car wouldn't start. There are others but you get the idea  . Both were fine once fully charged up at home via my charger; a Halfords Auto charger. Just as well as the Stag battery isn't cheap! As said, check for a drain anyway. |
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Last Edit: Aug 8, 2018 22:58:08 GMT by ChasR
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As said, it at least needs charging properly.
An hour or two isnt going to add much charge, the alternator output voltage is only similar to a battery charger so is only really capable of a bit of a top up in the space of an hour or two.
If you used a battery charger you wouldnt expect much success after that amount of time and would normally leave it at least over night.
At the minute your battery is just flat, you can do tests to find out whether its dead or not but they wont mean anything on a flat battery.
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