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Old 11-19-2011, 03:45 PM
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Battery chargers can't recognize my battery?

I have a few year old Bosch battery that 3 chargers have failed to grasp.

When I hooked it up to my 30 year old basic Schumacher charger it slams the needle back and forth from dead to charged. Since I wanted a charger that does desulfation I went and bought a fancy Schumacher XC75 and it wouldn't read that it was connected to a battery. Tech support had me override the microprocessor and go into a manual charging mode for 10 minutes then switch back to regular. It finally recognized the battery but as a 6volt. So I returned that charger and bought a even more expensive Schumacher that only does 12volt. This charger doesn't recognize the battery either. I would have just assumed there was a internal failure in the battery but the Schumacher tech told me that the charger would be doing something different if that were the case. If I jump start the car the alternator is able to charge the battery enough to get through running errands but not enough to have a good start the next day. But none the less the battery is taking and holding some type of charge through the cars charging system.

The battery is out of the car. I hooked the new charger up to a old Interstate battery and it reads and charges it fine. I was thinking about hooking jumper cables to the charger clamps while the Interstate while it gets charged and hook them to the Bosch and see what happens. Thoughts?

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Old 11-19-2011, 04:51 PM
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You have at least one bad cell in the bosch. If you put it on an old fashioned charger and zap it, it will prob show full charge, but when you put it under load ..... I'll bet money it will fail. Take it to your fav battery store and have them ck it under load. To me it's not worth the time to go back back and forth with charging the batt etc...... once stranded etc.... get it ck'd
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Old 11-19-2011, 06:40 PM
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I would say the battery is junk. Probably internally open
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Old 11-19-2011, 08:43 PM
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Quote:
Originally Posted by Ghetto Jet
The battery is out of the car. I hooked the new charger up to a old Interstate battery and it reads and charges it fine. I was thinking about hooking jumper cables to the charger clamps while the Interstate while it gets charged and hook them to the Bosch and see what happens. Thoughts?
hooking both batts up with jump cables will work (if the old batts are ok)

however i would take the batts to be tested with an electronic tester

a batt store, such as interstate, should be able to do this for you
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Old 11-19-2011, 09:46 PM
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Why do you want desulfation in your battery charger is it going to sit for a long time and is it a deep cycle battery.

1.Every battery has its own internal resistance ,when a charger is put to it
it doesnt short out.your battery has all the signs of a shorted circuit.
Kicks full on then off,the micro processor knows the current draw is too much.
thats why they said to bypass it.

2.the first charger recognized it as a 6 volt ,6 volt has less cells less resistance
to current,a shorted 12volt would show as a lesser value of resistance when the plates are shorted.As a default it would say 6 volt.The lesser the resistance the more current sink.

3.Putting jumpers on a shorted battery that has a high amp supply to it=welder
If the plates inside the lead acid battery are shorted bad news.

4. the voltage measured across the battery terminals will drop as the desulphation takes place as the internal resistance of the cells is reduced by the clearing of the crystals on the lead plates.
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Old 11-23-2011, 07:37 PM
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I had a truck that needed some extensive MIG welding done on the cab. When I dropped it off at the welding shop I disconnected the battery. At some point later they reconnected it to move the truck or something and forgot to pull a battery cable back off. After welding the truck wouldn't start. Buzzed and sparked the jumper cables when I jumpstarted it but otherwise seemed OK. Drove home fine but the next day the battery acted dead as a hammer again. My old battery charger acted just as you described. Banging the ammeter needle back and forth. I figured the welding had affected it and junked it.
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Old 11-23-2011, 07:44 PM
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You say your battery is a "few years old", time to change it.
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