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Any Tricks For Breathing Life Into Old 12v Batteries?


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#1 Elton

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Posted 26 June 2019 - 08:18 PM

I was at an auction last weekend and bid on a mobility scooter, thinking it would be a bit of cheap fun for the kids.

 

Everything seems to work, but the batteries are flat and I tried to charge them and then put a drop-tester on them and they are kaput. New ones seem bloody expensive.

 

They are the larger (about 30cm long) 60ah ones, which look like regular car battery size, and are sealed. Is there anything I can do to try to revive them, or do they need to go straight to the scrappy now?


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#2 chesters1

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Posted 26 June 2019 - 08:25 PM

Theres a small chance but an expensive one ,sealed batteries can dry out but its a pain removing the cover.
Know anyone with a smart charger? They can work revitalising batteries but with experience only in 25% of cases as batteries need to be looked after in life their plates are fragile.
I have this one (long in the tooth now) expensive charger but bought when we had a 3 battery motor home to look after the batteries as they dont like the crude charging system in cars so need looking after as deep cycle batteries are very expensive!
https://www.amazon.c...6/dp/B000VZAX7O
We have had the last battery on charge for a decade for emergency tv use in power cuts ,they dont trickle charge (which is the death of batteries) they monitor the voltage ,when it drops it charges it back up

Edited by chesters1, 26 June 2019 - 08:41 PM.

Believe NOTHING anyones says or writes unless you witness  it yourself and even then your eyes can deceive you

 

There is only one opinion i listen to ,its mine and its ALWAYS right even when its wrong

 

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#3 Elton

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Posted 26 June 2019 - 09:28 PM

I'll have a look, next time I get a chance, to see if I can remove the cover to see if the cells are dry. It's worth a try.

 

Had the new batteries not been so crazily expensive, I'd have binned these ones already, but anything is worth a go right now.


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#4 Phone

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Posted 27 June 2019 - 03:06 AM

Elton,

 

Consider buying a reconditioned (rebuilt) deep cycle marine battery.  About $20 ea over here.

 

Phone



#5 Huge_Vitae

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Posted 27 June 2019 - 09:10 PM

I was at an auction last weekend and bid on a mobility scooter, thinking it would be a bit of cheap fun for the kids


And you want us all to believe that! It’s like saying “I’m asking this for a friend.” Or me saying to the wife “I’ve bought this bottle of scotch because I thought it would look nice on the shelf!”

Ha!

I’ve had some good results blasting lithium and NiCad batteries with above volt (i.e. using a 24v charger on 18v batteries) power for a short time to wake them up and there are videos on YouTube how to do same with acid batteries but personally I would avoid following the instructions of the chap who uses a 40amp mig welder!
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#6 Martin56

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Posted 27 June 2019 - 09:32 PM

I'm no expert Elton, but why wouldn't a normal car battery work?? (I don't drive)

 

Might get a bit of fun before recharge??

 

Not as though the kids will be straying far from the garden & left stranded in middle of nowhere??


Edited by Martin56, 27 June 2019 - 09:44 PM.

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#7 chesters1

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Posted 27 June 2019 - 10:53 PM

Probably not the same type of use ,car batteries are designed to give big amps for a short period and deep cycle ones small amps for a long while .
Car batteries cannot take their volts taking down under 12.5 ish without stressing the plates whereas deep cycle ones can
I doubt grannie or kids will monitor the volts so a car battery wont enjoy the outings lol

The old trick of using high volts at low amps works for nicads but modern charges use high frequency to desulphate car batteries .
Sometimes lithium batteries go so low the protection circuit cuts in and they cannot be recharged ,plugging in their charger lots of times for 5 seconds a go trick it into charging again but it could take a few hours of doing it!

Edited by chesters1, 27 June 2019 - 11:00 PM.

Believe NOTHING anyones says or writes unless you witness  it yourself and even then your eyes can deceive you

 

There is only one opinion i listen to ,its mine and its ALWAYS right even when its wrong

 

Its far easier to curse the darkness than light one candle

 

Mathew 4:19

 

"To compel a man to furnish contributions of money for the propagation of opinions which he disbelieves and abhors, is sinful and tyrannical." Thomas Jefferson


#8 Martin56

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Posted 27 June 2019 - 11:26 PM

I bow to your superior knowledge (on this one) Chesters!!

 

Maybe Elton caught a bit of a cold this time?? - how much £ for the proper battery is too much £ re what he paid for the scooter??


Edited by Martin56, 27 June 2019 - 11:37 PM.

Fishin' - "Best Fun Ya' can 'ave wi' Ya' Clothes On"!!


#9 chesters1

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Posted 28 June 2019 - 06:14 AM

Probably like buying a second hand printer for a fiver and then realising the ink is expensive and once the inks bought you find it doesnt work! (been there!)

Believe NOTHING anyones says or writes unless you witness  it yourself and even then your eyes can deceive you

 

There is only one opinion i listen to ,its mine and its ALWAYS right even when its wrong

 

Its far easier to curse the darkness than light one candle

 

Mathew 4:19

 

"To compel a man to furnish contributions of money for the propagation of opinions which he disbelieves and abhors, is sinful and tyrannical." Thomas Jefferson


#10 Elton

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Posted 28 June 2019 - 09:22 AM

Yeah, the batteries are definitely more than the scooter, although I may be committed now, as the kids are pestering me for a go.

 

I've got a 24v charger over at my other workshop (I'm still moving premises). I'll try to bring it home next week and give it a try..


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