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Redneck Battery Recovery #5135143
06/15/19 06:29 PM
06/15/19 06:29 PM
Joined: Feb 2018
Posts: 86
Ohio
cwilliamsws6 Offline OP
cwilliamsws6  Offline OP

Joined: Feb 2018
Posts: 86
Ohio
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.


I'm 17 and I do my own oil changes and everything! smile
2007 Honda CR-V LX, 205K miles
Carquest conventional 5W-20
Carquest Premium 84356 filter
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135166
06/15/19 06:57 PM
06/15/19 06:57 PM
Joined: Jun 2003
Posts: 34,650
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,650
ME
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 07:33 PM
06/15/19 07:33 PM
Joined: Feb 2018
Posts: 86
Ohio
cwilliamsws6 Offline OP
cwilliamsws6  Offline OP

Joined: Feb 2018
Posts: 86
Ohio
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?


I'm 17 and I do my own oil changes and everything! smile
2007 Honda CR-V LX, 205K miles
Carquest conventional 5W-20
Carquest Premium 84356 filter
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135196
06/15/19 07:39 PM
06/15/19 07:39 PM
Joined: Nov 2011
Posts: 1,677
Lyndhurst NJ
Audios Offline
Audios  Offline

Joined: Nov 2011
Posts: 1,677
Lyndhurst NJ
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-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Redneck Battery Recovery [Re: Audios] #5135200
06/15/19 07:42 PM
06/15/19 07:42 PM
Joined: Jun 2012
Posts: 737
Reno, NV
redbone3 Offline
redbone3  Offline

Joined: Jun 2012
Posts: 737
Reno, NV
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 07:51 PM
06/15/19 07:51 PM
Joined: Feb 2018
Posts: 86
Ohio
cwilliamsws6 Offline OP
cwilliamsws6  Offline OP

Joined: Feb 2018
Posts: 86
Ohio
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]


I'm 17 and I do my own oil changes and everything! smile
2007 Honda CR-V LX, 205K miles
Carquest conventional 5W-20
Carquest Premium 84356 filter
Re: Redneck Battery Recovery [Re: cwilliamsws6] #5135277
06/15/19 09:05 PM
06/15/19 09:05 PM
Joined: Mar 2004
Posts: 22,479
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 22,479
Upstate NY
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 09:27 PM
06/15/19 09:27 PM
Joined: Jan 2010
Posts: 117
Panama CIty, Florida
mahansm Offline
mahansm  Offline

Joined: Jan 2010
Posts: 117
Panama CIty, Florida

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 06:13 AM
06/16/19 06:13 AM
Joined: Dec 2016
Posts: 9,119
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 9,119
Waco, TX
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 06:16 AM
06/16/19 06:16 AM
Joined: Dec 2016
Posts: 9,119
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 9,119
Waco, TX
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 07:07 AM
06/16/19 07:07 AM
Joined: Nov 2011
Posts: 1,677
Lyndhurst NJ
Audios Offline
Audios  Offline

Joined: Nov 2011
Posts: 1,677
Lyndhurst NJ
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-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Redneck Battery Recovery [Re: redbone3] #5135485
06/16/19 07:38 AM
06/16/19 07:38 AM
Joined: Sep 2007
Posts: 539
northern NY
Driz Offline
Driz  Offline

Joined: Sep 2007
Posts: 539
northern NY
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 08:10 AM
06/16/19 08:10 AM
Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
Kira Offline
Kira  Offline

Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
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 10:04 AM
06/16/19 10:04 AM
Joined: Aug 2005
Posts: 941
dayton oh
kc8adu Offline
kc8adu  Offline

Joined: Aug 2005
Posts: 941
dayton oh
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 12:45 PM
06/16/19 12:45 PM
Joined: Apr 2017
Posts: 2,011
Ohio
hallstevenson Offline
hallstevenson  Offline

Joined: Apr 2017
Posts: 2,011
Ohio
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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