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Author Topic: Advice about SLA batteries.  (Read 1771 times)

kendalboatsman

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Advice about SLA batteries.
« on: April 10, 2007, 07:18:05 PM »

I have got a couple of new 6v SLAs I bought about 7 years ago, they are still in their packaging and have been stored away. Will they still be OK or should I bin them and buy new?

Thanks
Clive :)
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ministeve

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Re: Advice about SLA batteries.
« Reply #1 on: April 10, 2007, 08:27:05 PM »

i would deffo get rid they will be in deep discharge
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BarryM

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Re: Advice about SLA batteries.
« Reply #2 on: April 10, 2007, 08:43:05 PM »

Probably dud buts what's to lose from giving them a a couple of trickle charges just to make sure?
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malcolmfrary

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Re: Advice about SLA batteries.
« Reply #3 on: April 13, 2007, 11:51:44 AM »

When trying to bring a suspect battery back to life, its best to avoid automatic chargers, as they have a habit of automatically deciding to not bother.
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"With the right tool, you can break anything" - Garfield

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Re: Advice about SLA batteries.
« Reply #4 on: April 13, 2007, 01:06:18 PM »

Try this:

  • Trickle charging the batteries at about 10mA for a couple of days.
  • Discharge them (put a bulb on it or something) until they reach about 5v.
  • Charge them up again at the normal rate (about 0.5A) for about 6 hours.

The chances are that if the batteries have been lying discharged for a few years they will be beyond redemption, however I would give this a go anyway it is possible they will still be ok.

kendalboatsman

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Re: Advice about SLA batteries.
« Reply #5 on: April 13, 2007, 04:14:33 PM »

Thanks for the advice, I do know another trick, through my trade as an Electric Motor Rewinder, of flashing the battery. So will try that if it doesn't work.

Clive :)
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kendalboatsman

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Re: Advice about SLA batteries.
« Reply #6 on: April 22, 2007, 04:07:03 PM »

Things look good so far. I found my old charger (swordsman til Dawn) and put the SLA on charge and it has charged fully so now I need to finish a boat to test it in.

I also paid a visit to Maplins at Erdington, Birmingham for a spare just in case. 6V 4.5Ah for a measly 5.99. Got two local model shops, one wanted a tenner and the other said "go to Maplins" because they didn't stock them.

Clive :)
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DickyD

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Re: Advice about SLA batteries.
« Reply #7 on: April 22, 2007, 04:19:06 PM »

Try these : http://www.component-shop.co.uk/html/lead-acid.html

Your battery 4.60 plus postage

Richard ;)

PS Also very efficient
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Richard Solent Radio Controlled Model Boat Club http://www.srcmbc.org.uk

kendalboatsman

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Re: Advice about SLA batteries.
« Reply #8 on: April 22, 2007, 04:25:30 PM »

Hi Richard,

I just checked it and apparently it is 4.90 including postage :)

Next one can come from there!

How is your Schutze behaving now? Mtroniks do an add on to plug in between an esc and the receiver to kill interference.

Clive
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DickyD

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Re: Advice about SLA batteries.
« Reply #9 on: April 22, 2007, 04:36:11 PM »

Took it out with the fleet today and it behaved impecably thanks Clive.
Have no idea what was wrong but it seems to have cured itself.
I have used Component Shop several times and they are cheap and very efficient.

Richard ;)
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