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Redneck Battery Recovery #5135143 06/15/19 05:29 PM
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cwilliamsws6 Offline OP
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If any of you remember my redneck ELD bypass story then you'll probably know the general direction this is headed.

My grandma is preparing to sell her RV and had my dad and I look over it and we found that all 3 batteries were dead. The starting battery had discharged to 4 volts, and the house batteries were both at 6 volts. Our trickle charger was able to save both the house batteries but would not even acknowledge the existence of the starting battery.

Since I do car audio, I have dual 250-amp 3-phase hairpin alternators from Custom Electric plus dual batteries in the back so I got an idea.

I got my jumper cables and connected my starting battery to the RV's and let my car idle for about 15 minutes, took the jumpers off, and it was now resting at 10 volts although slowly discharging but not nearly as bad as it was before. I quickly grabbed the battery and ran it up into the garage and connected it to the trickle charger which now turned on and began to finish recovering the battery.

If it's stupid but it works... it's stupid... but it works.


2007 Honda CR-V LX "The Linoleum Falcon" 210K miles
Carquest conventional 5W-20, Carquest Premium 84356 filter
"Bad decisions make good stories."
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135166 06/15/19 05:57 PM
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eljefino Offline
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Good reason to keep a dumb lump buzz box charger around.

Pics of your setup?

Re: Redneck Battery Recovery [Re: eljefino] #5135192 06/15/19 06:33 PM
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cwilliamsws6 Offline OP
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Originally Posted by eljefino
Good reason to keep a dumb lump buzz box charger around.

Pics of your setup?

The charger we had was a dumb lump buzz box from the 70s, and I have a newer Schumacher one as well.

Also what do you want to see? How I accomplished this or how my alternators and batteries are all together?


2007 Honda CR-V LX "The Linoleum Falcon" 210K miles
Carquest conventional 5W-20, Carquest Premium 84356 filter
"Bad decisions make good stories."
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135196 06/15/19 06:39 PM
Joined: Nov 2011
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Audios Offline
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iI think there were some youtube vids about guys recovering old nickel and lead acid batteries from power tools by blasting with high amperage, just tapping it on the terminals. Something about desulfating the plates? Just the thiught scares me, but maybe some people with bigger stones than me can try.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: Redneck Battery Recovery [Re: Audios] #5135200 06/15/19 06:42 PM
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redbone3 Offline
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That works (sometimes) on ni-cads. Ni-cads get strands between the layers that short out the battery, a blast at high amps burns them out and the battery will work again. I wouldn't try it on a lead acid battery on a bet.


2014 Passat Wolfsburg, 1995 Miata.
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135205 06/15/19 06:51 PM
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Posts: 255
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cwilliamsws6 Offline OP
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Okay here is pictures of my setup.

Here is the alternator, Custom Electric 250-amp hairpin 3-phase
[Linked Image]

Here is my starting battery, I beat out the sides of my battery tray with a hammer and shoved in a Walmart-special 24F in place of the old 51R, with an improvised tie-down until I find something better.
[Linked Image]

The above are both old pictures, I've since attached a run of 1/0 gauge OFC wire from the alternator direct to the battery:
[Linked Image]

Here's in the back of the car, the batteries are behind the speaker box and not visible in the picture.
[Linked Image]

Last but not least, tonight's festivities:
[Linked Image]


2007 Honda CR-V LX "The Linoleum Falcon" 210K miles
Carquest conventional 5W-20, Carquest Premium 84356 filter
"Bad decisions make good stories."
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135277 06/15/19 08:05 PM
Joined: Mar 2004
Posts: 23,142
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Donald Offline
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Originally Posted by cwilliamsws6
If any of you remember my redneck ELD bypass story then you'll probably know the general direction this is headed.

My grandma is preparing to sell her RV and had my dad and I look over it and we found that all 3 batteries were dead. The starting battery had discharged to 4 volts, and the house batteries were both at 6 volts. Our trickle charger was able to save both the house batteries but would not even acknowledge the existence of the starting battery.

Since I do car audio, I have dual 250-amp 3-phase hairpin alternators from Custom Electric plus dual batteries in the back so I got an idea.

I got my jumper cables and connected my starting battery to the RV's and let my car idle for about 15 minutes, took the jumpers off, and it was now resting at 10 volts although slowly discharging but not nearly as bad as it was before. I quickly grabbed the battery and ran it up into the garage and connected it to the trickle charger which now turned on and began to finish recovering the battery.

If it's stupid but it works... it's stupid... but it works.


Almost all alternators are three phase. Not sure why you need a lot of power for car audio? Why so loud? I am old enough to be on Medicare and listened to my share of loud rock and roll music when I was young. Now I listen to a hissing static in my ears 24x7 thanks to tinnitus.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135298 06/15/19 08:27 PM
Joined: Jan 2010
Posts: 123
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mahansm Offline
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Instead of beating on the CR-V battery tray buy one for an Odyssey. About $25, fits the same space, and holds a 24F perfectly. The cables even reach.
I swapped out the 51 in our '14 CR-V when we towed it behind our motorhome for about 5 hours and it went flat. It died shortly thereafter.


'14 Honda CR-V (toad)
'09 Honda Odyssey
'99 Bluebird Wanderlodge 43 LXi
Re: Redneck Battery Recovery [Re: eljefino] #5135448 06/16/19 05:13 AM
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Linctex Offline
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Originally Posted by eljefino
Good reason to keep a dumb lump buzz box charger around.


Always!

I have a Black & Decker automotive "smart charger" that hates to see anything under 10 volts.

Using jumper cables or the "dumb" buzz box to "fool" it- - Once the voltage is high enough, it'll take over and charge like it should.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Redneck Battery Recovery [Re: redbone3] #5135452 06/16/19 05:16 AM
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Linctex Offline
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Originally Posted by redbone3
I wouldn't try it on a lead acid battery on a bet.


I've tried using my DC arc welder on low amps (40-50?) and OCV of ~35-40 to "blast" a lead acid battery back to life.

It will boil the acid - but it won't make a bad battery new again.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135472 06/16/19 06:07 AM
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Audios Offline
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Wouldnt a larger capacitor be lighter and cheaper than having 3 batteries in the car?


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: Redneck Battery Recovery [Re: redbone3] #5135485 06/16/19 06:38 AM
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Driz Offline
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Originally Posted by redbone3
That works (sometimes) on ni-cads. Ni-cads get strands between the layers that short out the battery, a blast at high amps burns them out and the battery will work again. I wouldn't try it on a lead acid battery on a bet.



Yup that does work on nicads. Just a couple taps with a MiG or wire feed welder works .

Re: Redneck Battery Recovery [Re: Driz] #5135508 06/16/19 07:10 AM
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Kira Offline
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Driz: Do you ground the battery's negative then touch the positive with the welder? Thanks

Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135600 06/16/19 09:04 AM
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kc8adu Offline
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this is why i keep the old dumb chargers.
but this has a benefit.
i get lots of batteries given up for core deposit that are still young but deep discharged to the point of being ignored by "smart" chargers.
and these often come in groups of 4 since my source is the core pile of a heavy truck dealer.
the jumpstart technique is just as good as a dumb charger.
dont even need run run the donor.
all that is needed is to get the battery above around 8v.
this seems to be the point where both of my newer chargers will "see" that a valid battery has been correctly connected.

Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135699 06/16/19 11:45 AM
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hallstevenson Offline
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Jump-starting a "dead" battery and then driving the car for a while is how 90% of car owners deal with this situation. There will be "experts" who critique this but to repeat what you said, "it works".

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