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Montana 911
Join Date: May 2002
Location: Montana
Posts: 5,818
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Charge the battery?
So I have access to a nice battery charger and currently problems with the electrical system in my car. I have charged the old battery twice and it takes a charge but then will only last 25 miles or so...dead. I noticed that when I place the charger on and set the timer the amps is over 40...though this was normal.
Today I got another battery from a 993 that had been sitting. Before I install it I wanted to give it a charge and the load on the charger was about 35 amps at first and after a few minutes dropped to 25 amps. So this has me thinking the old battery might be going bad and my alternator is ok. I am going to install the newer battery tomorrow and test the voltage accross the termainals to test the alternator. Any reason for the difference in Amps when charge is applied to the batteries?
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H.D. Smith 2009 997.2 S 3.8 PDK 2019 Ford Ranger Lariat FX4 Baby Raptor 2019 Can Am Renegade 1000R XC 2020 Yamaha YFZ450R |
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09-01-2006, 11:57 AM
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Registered
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One of the battery could have a dead cell or a couple of dead cells. Bring the battery to Pep Girl or the Manual Zone and they will test it for free.
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09-01-2006, 12:57 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Battery accepts as much charge as necessary depending on it's state of charge. An almost dead battery will accept more amps; one that is fully charged, less.
However, more charging amps creates more heat. Excess heat can warp the plates and cause irreversible damage. So don't overcharge. A low amp trickle charge iover a longer period is preferable. BTW, if the battery needs charging, it's because of one of two reasons: a. It's discharged because more current is leaving than coming in. b. There could be an internal malfunction in the battery preventing proper electrical storage. After charging the battery as suggested above, reinstall in the car, then connect a voltmeter to the battery terminals. Open circuit voltage should be high 12, low 13volts. With engine running, the charging rate should be high 13, low 14 volt range. If not, suspect the alternator or alternator circuit (faulty path which includes ground and battery connections). Hope this helps, Sherwood |
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09-01-2006, 01:23 PM
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Montana 911
Join Date: May 2002
Location: Montana
Posts: 5,818
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Thank you both, yeah I hope I didn't damage the battery with the 45 min charge at 25 amps.
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H.D. Smith 2009 997.2 S 3.8 PDK 2019 Ford Ranger Lariat FX4 Baby Raptor 2019 Can Am Renegade 1000R XC 2020 Yamaha YFZ450R |
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09-01-2006, 01:36 PM
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