[AT] Batteries charged backwards.
Cecil Bearden
crbearden at copper.net
Thu Feb 13 06:37:18 PST 2020
The problem I cannot understand is why, when I connected 2 incandescent
headlights in parallel to the battery it would not discharge the battery
completely. My battery supplier told me to then use a 6 volt light. I
have seriously thought about just hooking both in series and then using
them as power for arc welding. A welding rod would discharge them
quickly and completely. Welding can be done using batteries as power...
I charge my batteries outside for safety. These are sealed batteries.
Cecil
On 2/13/2020 8:28 AM, Stephen Offiler wrote:
> I do not have ADD, although I am starting to wonder what personal
> issues you might have, Thomas. And no, the point of this exercise is
> not to reverse the polarity, The point is to make the best possible
> attempt to recover two batteries that have been accidentally
> reverse-charged. That involves much more than reversing the
> polarity. There's a right way and a lot of wrong ways to tackle each
> of the steps. Discharge. Repolarize. Recharge.
>
> SO
>
>
> On Thu, Feb 13, 2020 at 9:08 AM Thomas Martin <tmartin at xtra.co.nz
> <mailto:tmartin at xtra.co.nz>> wrote:
>
> Do you have ADD? The point of this exercise is to reverse the
> polarity of a battery.
>
>> On 13 February 2020 at 23:15 Stephen Offiler <soffiler at gmail.com
>> <mailto:soffiler at gmail.com>> wrote:
>>
>> For some actual information on lead-acid charging, try this:
>>
>> https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery
>>
>>
>>
>>
>> On Thu, Feb 13, 2020 at 3:49 AM Thomas Martin <
>> tmartin at xtra.co.nz <mailto:tmartin at xtra.co.nz>> wrote:
>>
>> Hi Dean
>>
>> After the dead battery is connected to the charged 12v
>> battery in parallel, a battery charger is connected, (the
>> charged battery
>>
>> is there only to dictate the polarity), and charging can
>> commence.
>>
>> Tom
>>
>>> On 13 February 2020 at 20:41 deanvp at att.net
>>> <mailto:deanvp at att.net> wrote:
>>>
>>> Tom,
>>>
>>> Could you explain this a little further. If the current from
>>> the jumper battery does not have any effect(affect) on the
>>> dead battery how does it charge it up?
>>>
>>> Dean VP
>>>
>>> Apache Junction, AZ
>>>
>>> *From:* AT <at-bounces at lists.antique-tractor.com
>>> <mailto:at-bounces at lists.antique-tractor.com>> *On Behalf Of
>>> *Thomas Martin
>>> *Sent:* Wednesday, February 12, 2020 12:47 PM
>>> *To:* Antique Tractor Email Discussion Group
>>> <at at lists.antique-tractor.com
>>> <mailto:at at lists.antique-tractor.com>>
>>> *Subject:* Re: [AT] Batteries charged backwards.
>>>
>>> Stephen
>>>
>>> Well it appears you do not understand the difference between
>>> connecting in series and parallel.
>>>
>>> When you jump start a vehicle, one connects in parallel, the
>>> current from the jumper battery does
>>>
>>> not have any affect on the the dead battery.
>>>
>>> Tom.
>>>
>>> On 13 February 2020 at 07:52 Stephen Offiler
>>> <soffiler at gmail.com <mailto:soffiler at gmail.com>> wrote:
>>>
>>> I wouldn't purposely put 50 amps into a totally dead
>>> battery if I didn't have to, but then we have the
>>> example cited by others, the jump-start. Who-knows how
>>> many amps will flow; limited only by the internal
>>> resistance of the batteries and the cables &
>>> connections. I don't think many people appreciate that
>>> a jump-start is actually sort of a hail-Mary maneuver.
>>> If you didn't need to get the car/truck/tractor started
>>> ASAP, the smart move is to charge the battery slowly and
>>> correctly. People are going to chime in and say "I've
>>> been jump-starting my entire life and never had a
>>> problem!" OK. Me too. But the issue here is that it's
>>> impossible to know how much you might have shortened the
>>> life of that battery by hitting it with that big
>>> uncontrolled amperage surge. In Cecil Bearden's case,
>>> he's not stuck in a field or a parking lot or whatever.
>>> He has the opportunity to do it right. And that
>>> definitely does NOT include hitting it with a giant surge.
>>>
>>> SO
>>>
>>> On Wed, Feb 12, 2020 at 1:08 PM Thomas Martin <
>>> tmartin at xtra.co.nz <mailto:tmartin at xtra.co.nz>> wrote:
>>>
>>> Surely US battery chargers have adjustable amperage?
>>>
>>> I thought it was a given that you wouldn't put 50
>>> amps into a dead battery...
>>>
>>> Tom
>>>
>>> On 13 February 2020 at 03:14 Stephen Offiler <
>>> soffiler at gmail.com <mailto:soffiler at gmail.com>>
>>> wrote:
>>>
>>> Hold on. A completely dead 12V battery
>>> connected to a good 12V battery is going to
>>> cause very large current to flow into the dead
>>> one. This is not a good idea.
>>>
>>> SO
>>>
>>> On Wed, Feb 12, 2020 at 9:08 AM <
>>> szabelski at wildblue.net
>>> <mailto:szabelski at wildblue.net>> wrote:
>>>
>>> Cecil,
>>>
>>> I agree with completely discharging the
>>> batteries and then putting the batteries in
>>> parallel one at a time with a good 12V
>>> battery. The batteries will try to equalize
>>> when in parallel. When you drain the
>>> battery, take the load off and let the
>>> battery sit for a while, then put the load
>>> back on and drain some more.
>>>
>>> You should use a battery charger that has a
>>> trickle charge feature. This puts a full
>>> charge into the battery at first, then drops
>>> down to a small charge to top the battery
>>> off. You may have to do this several times
>>> and should leave the charger on for at least
>>> one full day. Don’t rush the job.
>>>
>>> You can also check that each cell is good by
>>> taking a reading between each cell. A bad
>>> cell will indicate a lower charge then the
>>> others. Do this with every recharge attempt
>>> and note if you’re making any progress.
>>>
>>> Don’t know if you’ve ever gone on-line to
>>> look for videos on bringing dead batteries
>>> back to life, but their are some that show
>>> how to drain a battery, rinse it out, then
>>> refill and recharge. They appear to work out
>>> quite well, but I can’t swear by them since
>>> I’ve never done anything like this myself.
>>>
>>> Good luck!
>>>
>>> Carl
>>> ----- Original Message -----
>>> From: Thomas Martin < tmartin at xtra.co.nz
>>> <mailto:tmartin at xtra.co.nz>>
>>> To: Antique Tractor Email Discussion Group <
>>> at at lists.antique-tractor.com
>>> <mailto:at at lists.antique-tractor.com>>
>>> Sent: Wed, 12 Feb 2020 00:24:36 -0500 (EST)
>>> Subject: Re: [AT] Batteries charged backwards.
>>>
>>> Hi Cecil
>>> I consulted a very good friend on the
>>> other-side of the isle.
>>> Tony is auto-electrician, of vast car, truck
>>> & tractor experience.
>>> He says you MUST discharge the batteries,
>>> separately with a bulb.
>>> They need to completely discharged. No
>>> measurable voltage.
>>> Then one battery at a time needs to be
>>> placed in parallel with another
>>> fully charged 12v battery, they then need to
>>> be connected to a 12v
>>> charger...
>>>
>>> Tom
>>>
>>> > On 12 February 2020 at 15:31 Cecil Bearden
>>> < crbearden at copper.net
>>> <mailto:crbearden at copper.net>> wrote:
>>> >
>>> >
>>> >
>>> > > I had 2 group 31 batteries out of the
>>> tractor that were completely
>>> > > dead. I hooked them up in series and
>>> connected my 24Vcharger to them
>>> > > as It was handy and I wanted to charge
>>> both. After a couple of days I
>>> > > checked them and found that I had hooked
>>> the charger backwards. I
>>> > > hooked a couple of incandescent
>>> headlights to drain the battery, but
>>> > > after 3 days they won't light up the
>>> headlights, but they still have a
>>> > > lot of spark when shorted with cables..
>>> A guy at my battery shop said
>>> > > I should hook up a 6volt light to them
>>> and use that to run them
>>> > > down.... At $100/ea, I need to try to
>>> save these...
>>> > > Cecil
>>> >
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