Battery charging

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DaiRees
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Battery charging

Post by DaiRees » Mon Sep 19, 2016 7:44 pm

Still a bit nervous about vehicle electrics after owning Peugeots for a combined total of around 17 years :shock: :cheesy:

I'm getting the occasion "Battery Low" message and complete refusal of the stop/start system to work (not that that bothers me, if it worked I'd turn it off!). But it's got me thinking about the state of my battery, I do a lot of short trips which obviusly isn't great for the battery. However when I do a longer trip I'd expect the battery to get a good charge and for the stop/start to start functioning again, but even after a few hours of motorway driving it doesn't come back to life and the computer reports that stop/start is unavailable because the battery is charging.

So, especially with the winter approaching, I'd like to use my (Halfrauds fully automatic) battery charger just to give the battery a bit of a boost. I've only ever charged batteries that were removed, or at least disconnected from the vehicle, but I don't really want to disconnect it in case I lose settings all over the place! So the question is, is it safe to charge it while it's still connected? If so I'm guessing +ve to terminal and -ve to chassis earth?
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Re: Battery charging

Post by steve_earwig » Mon Sep 19, 2016 9:02 pm

I think the earth thing is for jump leads, probably doesn't matter though.

I'm probably not going to be much help but I was talking to my dad about this recently, he's not keen on hooking a charger up to his battery while it's still connected as they have auto transformers in them so it's actually seeing mains, together with all the transients coming down the line. However I connected my Optimate to all sorts of cars (and bikes) with no issues for 15 years or so (recently replaced it finally expired after charging all the batteries in Goran's shop :roll: with a CTEK because Optimates are expensive and have something of a bad rep these days).

Halfords though, not sure I'd trust this without an oscilloscope to see exactly what it's shoving out...
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Re: Battery charging

Post by Doggy » Mon Sep 19, 2016 11:58 pm

What about getting one of those standby battery gadgets that plugs into the lighter socket while you disconnect / charge the battery?

(Never tried myself, but I hear they work).
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Re: Battery charging

Post by Welly » Tue Sep 20, 2016 7:43 am

Mmm, your car is 4...approaching 5 years old? my first Volvo Battery lasted about 9 years :?

My thoughts are to replace the battery as you'll be putting undue stress on the alternator. Everything is crap these days so maybe 4/5 years is 'old' now? don't you have a separate battery for the stop/start bullshit?

There's a lot of mumblings on the friendly* Volvo Forum about alternators crapping out at seemingly low mileages, could be worth checking the Voltage it's chucking out especially when loaded up.
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Re: Battery charging

Post by DaiRees » Tue Sep 20, 2016 8:01 pm

Just turned 4 in July :wink:

Nah I don't think there's anything wrong with the alternator Welly, they're notorious for the battery needing to be fully charged before the stop/start will work. Imagine the amount of electrical gadgets on this thing that are sucking power from the battery, then I'm doing lots of really short journeys, I'm sure I'm just not giving it enough of a charge. It's not struggling to turn the engine over or anything, and I'm sure the car would tell me persistently if it thought the battery was cream crackered.

And yes there is a 2nd battery to "assist" with the stop start system, my understanding is that it's there to help with the auxiliary systems when the engine's off (a/c fans, lights etc.). I don't believe it's used during "normal" operation.
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Re: Battery charging

Post by DaiRees » Wed Sep 21, 2016 8:59 pm

Well the plot thickens, if I said AGM and EFB batteries I bet some of you would know all about them and others would be as bemused as I was.

I've had a look at the battery and although it doesn't say so on the label, googling the part number leads me to believe that it's an AGM (Absorbant Glass Mat) battery. I also found the smaller "assist" battery hiding under the scuttle panel to the left of the main battery, that one's definitely AGM because it says on the top, right next to the FoMoCo logo :roll:

And, surprise surprise, it turns out that my Halfrauds battery charger (that's only a few years old) isn't suitable for AGM batteries! So now I'm off to search for a charger suitable for AGM batteries...
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Re: Battery charging

Post by steve_earwig » Wed Sep 21, 2016 10:12 pm

I have one of them, it's made by CTEK...
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Re: Battery charging

Post by Welly » Thu Sep 22, 2016 8:11 am

Ha ha you've been FoMoCo'd in yer Volvo.

Should see mine it's littered with Ford labels :roll:

I'm sure you'll find a reasonable digital trickle-charger out there and there should be no reason why you can't hook it up 'live' on the car as it were.

If you think about it your alternator must be under constant load when you drive so it's the right way to go in looking after the battery end of things.
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Re: Battery charging

Post by DaiRees » Thu Sep 22, 2016 5:45 pm

Yes I agree, I think keeping the battery in good shape will extend it's life considerably, and having recently discovered the price of them :shock: that can only be a good thing!!

I've ordered a charger, surprisingly enough a CTEK one Steve. Reading various interweb informations they seem to be the only way to go...

https://www.amazon.co.uk/CTEK-MXS-5-0-T ... ek+mxs+5.0
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Re: Battery charging

Post by steve_earwig » Thu Sep 22, 2016 7:02 pm

Ah, the same one I just bought :cheesy:
Talking bollocks sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - Can somebody stand by with an extinguisher?

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Re: Battery charging

Post by OllieNZ » Thu Sep 22, 2016 8:16 pm

I deal with AGM batteries on a near daily basis at work, we refer to them as jelly batteries. The best way to find out what you can and can't do with it is see if you can find a manual by the battery manufacturer. Our ones (made by concorde) are able to be charged using either constant potential or constant current. The biggest issue with them is whether or not it's sealed or valve regulated. A sealed one can explode if incorrectly charged where as a valve regulated one will vent.

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Re: Battery charging

Post by Welly » Fri Sep 23, 2016 7:50 am

OllieNZ wrote:A sealed one can explode if incorrectly charged where as a valve regulated one will vent.
Seems straight forward enough, where's the nearest mains plug? :cheesy:
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Re: Battery charging

Post by Doggy » Fri Sep 23, 2016 1:00 pm

OllieNZ wrote:...A sealed one can explode if incorrectly charged where as a valve regulated one will vent hydrogen gas, like the Hindenburg.
FTFY :D

For our younger readers: http://www.independent.co.uk/news/scien ... 17996.html
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Re: Battery charging

Post by steve_earwig » Fri Sep 23, 2016 1:29 pm

Oh, the stupidity :roll:
Talking bollocks sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - Can somebody stand by with an extinguisher?

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Re: Battery charging

Post by DaiRees » Fri Sep 23, 2016 6:42 pm

Well it's charging right now so I hope it doesn't explode.... :shock:
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