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PostPosted: Sun Feb 11, 2018 6:44 pm 
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No science what so ever but I feel once you’ve run a battery flat it’s never the same again...fancy charger or no! :?

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PostPosted: Sun Feb 11, 2018 7:59 pm 
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Provided it was 100% before and not left flat for long it should be fine after a proper slow charge.Often though folks don’t charge for long enough, and certainly expecting the cars alternator to do the job is doomed to failure.


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PostPosted: Sun Feb 11, 2018 8:07 pm 
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Yep, just as leadfoot says. A looooooooong slow charge is the answer. We seem to have lost the appetite for using hydrometers, distilled water and topping up to test individual cells too. Mind you, most batteries now don't have battery caps for the separate cells.


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PostPosted: Sun Feb 11, 2018 8:57 pm 
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Once the battery gets under around 10 volts, it's considered ruined, though I've always got them to bounce back but I have noticed they are not usually the same. With Starting Batteries, a high current charge (like 50 Amps or more) helps.

If they are run dead flat, sometimes you can get them back, but rarely. If you do, I'd only consider it good enough for one start so you can go get a new battery.


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PostPosted: Sun Feb 11, 2018 9:06 pm 
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When I was at Bandiana Spider we had a little Chinese bloke who ran the main battery shop. His rubber apron was bigger and heavier than he was! He used to strip and remanufacture the heavy plant and truck batteries, new central row plates - the whole lot and tar the tops back into the casings. Never seen it done before or since. We all had to spend a couple of weeks working there with him. I don't remember anyone at the main workshop ever having to buy a new battery again!!!!!


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PostPosted: Sun Feb 11, 2018 9:28 pm 
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Leadfoot1 wrote:
Provided it was 100% before and not left flat for long it should be fine after a proper slow charge.Often though folks don’t charge for long enough, and certainly expecting the cars alternator to do the job is doomed to failure.



I can only dream of the charging power of an alternator... dynamo for me I'm afraid... going to try a slow charge but I think it’s just another part of the new disposable world! :)

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PostPosted: Sun Feb 11, 2018 9:43 pm 
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Anyone bought a new decent battery recently with plenty of Ah?

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PostPosted: Sun Feb 11, 2018 9:46 pm 
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A very slow rate charger is one of those fixed .5 or so milliamp/hr chargers used to keep a caravan battery topped up during the winter. I use one to keep my laid up RCSport charged up as it's got the alarm on permanently. Sorry to use the word caravan but I tried to say it softly!


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PostPosted: Mon Feb 12, 2018 10:35 am 
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The biggest problem with most batteries nowadays is that the plates are so damn thin. They simply don't last like they used to even if they are looked after, and are made to be a disposable item.

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PostPosted: Mon Feb 12, 2018 11:12 am 
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mk1 wrote:
The biggest problem with most batteries nowadays is that the plates are so damn thin. They simply don't last like they used to even if they are looked after, and are made to be a disposable item.

True but they are also specified to be light - to save those emissions !


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