Battery baclwards

   / Battery baclwards #1  

deepNdirt

Veteran Member
Joined
Sep 17, 2009
Messages
2,101
Location
Nth East Ga, USA
Tractor
yanmar YM-1700
Yesterday my wife was at the local flea market and called to tell me about a man there is selling used/refurbed car batteries, said to have a 1 - year old 550 cca battery from Walmrt for 20.00, I had her go ahead and get it, I have plans to sale my Roper tractor and didn't want to let my New battery go with it, This used 20.00 battery would provide the replacement It needed,
Now here comes the mystery:confused2:.... the first thing I done was to put this battery on my load tester, the needle never moved and was as if the battery was dead flat, so I went for the old school field test, arc the Pos/neg terminals together and boy was it hot, almost could weld with it, I just thought perhaps the tester might have went bad or a wire come loose inside,............ Ok on to changing out the batteries, now keep in mind I haven't started the tractor in several weeks though last time I did it was working good, So I did a quick swap of the 2 batteries, Now I'm on to starting the tractor and nothing happens, I double check all connection and everything thing is good, So I decide to cross out the Solenoid in attempt to start the tractor, The starter spins however was not kicking it into the ring gear/flywheel in order to turn over the engine, Hmmmm! perhaps not as hot of battery as I originally thought!, so I go for my 200 amp charger/jump starter , When I attempt to connect the Leeds Pos+ to Pos+ and neg- to neg-etc,etc, Sparks flew as though I was connecting them wrongly (backward), again I double checked my connections and all was correct, Now I'm thinking this sure is strange:confused: I then remove the battery and reconnect the tester to it, although this time I connect it backward, Pos+ to Neg- and Neg- to Pos+ and i finally get a reading, the needle now moves to green for good battery, I leave the load on it for 15 seconds and the needle stay in the green, Wallah! now I'm getting somewhere but still not fully understanding what is going on here, I now realize that when at first the starter was spinning it must have been spinning backwards.... so I re-install the battery into the tractor but this time I make the connection in reverse just as i did with the tester ( Pos to Neg /Neg to Pos ) The tractor Now spins over and starts right up, Although the battery terminals are now in fact backward, ...................................
Anyone ever experienced this before? Has this battery been wrongly marked from factory? or has the person who rebuilt this battery in someway done something wrong causing the reverse polarity? this could be confusing to who ever might buy this tractor,:cool: so I doubt I will leave it in there, I'm going to monitor the battery until next weekend to see if the charge holds or not. and Might confront the man who sold it to my wife to find out what exactly he had done in the reconditioning of this battery,
 
   / Battery baclwards #2  
Counterfeit, Chinese knock off. Flee markets are full of this stuff. And yea, the terminals are probably marked wrong.

When I worked in Africa, we had a terrible time finding actual brand name parts that were not counterfeit. Sourcing 120 AHr truck batteries that cost three times what they would here, and you bend over to pick it up expecting a good tug on your back, and it weighs about 30 lbs.... All labeled with brand names.
 
   / Battery baclwards #3  
ok.. so you bought a battery charged up backwards by a moron?

discharge the battery with an incandescent load.. FULLY bone dead.. 0 volts.

charge it up good... correct polarity..
 
   / Battery baclwards #4  
ok.. so you bought a battery charged up backwards by a moron?

discharge the battery with an incandescent load.. FULLY bone dead.. 0 volts.

charge it up good... correct polarity..

Funny, I have been working with batteries all my life, and I never knew this was possible...
 
   / Battery baclwards #5  
Yes it is possible to reverse charge a lead acid battery. I would consider just tell the next owner that is what happened rather than do another deep cycle discharge again. Running a lead acid battery completely down to nothing is really hard on a battery and cuts it's useful life down quite a lot. Not sure how a reverse charge affects useful life though either. Heard of some going years without trouble.
 
   / Battery baclwards
  • Thread Starter
#6  
ok.. so you bought a battery charged up backwards by a moron?

discharge the battery with an incandescent load.. FULLY bone dead.. 0 volts.

charge it up good... correct polarity..
Easy as that! OK I'll give it a try , I wonder if this guy did in fact know what he was doing and puposely charged the battery backwards in order for it to hold a charge? do you think the battery was bad or had a dead cell and this is a decisive way to revive a battery?
after all it was purchased from a "flea market"
 
   / Battery baclwards
  • Thread Starter
#7  
Funny, I have been working with batteries all my life, and I never knew this was possible...

Yeah! Me either, but of course I always double check to be sure the connection are correct, it never occurred to me that one could be charged backwards:confused3:
 
   / Battery baclwards #8  
i've seen sulafted batteries somewhat revived by a desulafting charger.. but have never seen a battery with a dead cell come back.. no matter what was done to it.

I have seen bat's charged backwards in tractors.

I'd put it back standard.

it's a used bat..it's life is already limited anyway.. and it's being sold on a used machine.....
 
   / Battery baclwards #9  
yea its possible. you said "refurbed" batteries. there is a way to refurb a battery. u take a dead one and totally discharge it, then reverse chsarge it. takes a week of charging discharging, with a series of low current and high charging cycles, but u can reverse charge them and get yeats out of them that way, he should either mark them or tell u though. thre reverse chasrges supposedly burn the scale/corrosion off plates which is why they reguvinate. i think i readf about it on tbn, maybe rural living forum? there was a guy on the thread doing it with sevearal batts and wass having success in his tests. i think it goes back to ww2, i think he said they did it back then as batts were short supply. also there are studies on it as ell as internet stuff. im sure u can find it on you tube.
 
   / Battery baclwards #10  
there are also some chemical baths you can cook up to do so.. but unless doing it to a number of batteires.. doing it for one would be IMHO.. cost prohibitive.
 

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