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Tedc
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03-04-2020, 06:57 PM
1

Not used for a couple of weeks = Flat Battery

I went out to move the car out of my way, so that I could sort the garage.

Guess what?

No starter, no lights, no anything.

Only an idiot would forget to keep his car charged during the Lock in!

It's been in there for, about, 3 weeks!

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03-04-2020, 07:27 PM
2

Re: Not used for a couple of weeks = Flat Battery

Originally Posted by Tedc ->
I went out to move the car out of my way, so that I could sort the garage.

Guess what?

No starter, no lights, no anything.

Only an idiot would forget to keep his car charged during the Lock in!

It's been in there for, about, 3 weeks!

If it was dead in three weeks, it was probably shagged anyway.
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03-04-2020, 07:31 PM
3

Re: Not used for a couple of weeks = Flat Battery

May just be the battery terminal connections if there are no lights whatsoever? First thing I'd do is disconnect them, clean them up and try it again...
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03-04-2020, 07:40 PM
4

Re: Not used for a couple of weeks = Flat Battery

Originally Posted by Besoeker ->
If it was dead in three weeks, it was probably shagged anyway.
Not necessarily, some modern cars have a higher parasitic drain than the older ones, and can drain a battery in 2-3 weeks of no use.
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03-04-2020, 08:30 PM
5

Re: Not used for a couple of weeks = Flat Battery

Originally Posted by fender ->
Not necessarily, some modern cars have a higher parasitic drain than the older ones, and can drain a battery in 2-3 weeks of no use.
My car is fairly modern with all sorts of electronics. My wif and I had a six week stay in USA with the car parked close to the airport. I have to admit I had concerns about the battery. It was fine.
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03-04-2020, 09:24 PM
6

Re: Not used for a couple of weeks = Flat Battery

Had to fit a new battery to daughters car the other day after two weeks, it was ten years old. I recommend going out every day and giving them a short turnover.....
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03-04-2020, 11:00 PM
7

Re: Not used for a couple of weeks = Flat Battery

Originally Posted by OldGreyFox ->
Had to fit a new battery to daughters car the other day after two weeks, it was ten years old. I recommend going out every day and giving them a short turnover.....
That's fine BUT you must let the car run at idle speed for 10+ minutes every time you do it.
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03-04-2020, 11:10 PM
8

Re: Not used for a couple of weeks = Flat Battery

Does it charge the battery if you just leave it ticking over same as when you're defrosting icy windows? If so, how long does it need to run for?
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04-04-2020, 12:41 AM
9

Re: Not used for a couple of weeks = Flat Battery

It is funny how for years manufacturers would fit smaller and smaller batteries, My Mitsubishi Starwagon had a tiny battery but along came engine management computers and suddenly batteries got bigger and bigger. My son's Nissan Navara has two large starter batteries though my similar Isuzu Dmax gets away with one. (I don't know the Amp hrs but that is generally just a function of size.)

I do agree however that if it completely discharged in a couple of weeks it needs changing assuming, as someone else pointed out, it is not corroded terminals.
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04-04-2020, 12:46 AM
10

Re: Not used for a couple of weeks = Flat Battery

Originally Posted by Mups ->
Does it charge the battery if you just leave it ticking over same as when you're defrosting icy windows? If so, how long does it need to run for?
Yes it does. I was told that it takes about 10 minutes to replace the energy used by starting but I would double that if the battery is a bit dodgy.

Having said that a good battery should have many starts in it without recharging.
 
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