Hopefully somebody who knows lead-acid batteries and charging can shed some light on this. I've got a small 1.5 amp smart charger, and a 10 amp old school charger that will easily overcharge a battery. My knowledge of charging 12 volt batteries is the smart chargers get them up to about 14.5 volts, and they can be floated at about 13.2 volts. Fully charged and sitting idle they sit at about 12.6 volts. The little smart charger follows that charging method.
So I have a two 6 volt batteries for the Lincoln. I had bought an Optima battery when I had to travel out to Arizona to see if I could get it running, since the one in it was dead as a doornail. Charging the Optima with the little smart charger (it does 6 volts or 12 volts), it follows the same pattern at half the voltage. I bought a replacement Duracell SLI2 from Batteries Plus, since that's what was in the car. The Optima unfortunately is much smaller physically, though it has 1000 cranking amps. The Duracell does fit the battery tray perfectly, though it's only 675 cranking amps.
Now the Duracell is behaving strangely compared to other batteries. The smart charger gets it up to about 6.8 volts and it won't go any higher. If I put the old school 10 amp charger on it, it will get up to 7.2 volts, which is where the smart charger would normally terminate. Trying to figure out whether it's having a problem or if this is just how it behaves. I assume it would charge like any other lead-acid battery.
So I have a two 6 volt batteries for the Lincoln. I had bought an Optima battery when I had to travel out to Arizona to see if I could get it running, since the one in it was dead as a doornail. Charging the Optima with the little smart charger (it does 6 volts or 12 volts), it follows the same pattern at half the voltage. I bought a replacement Duracell SLI2 from Batteries Plus, since that's what was in the car. The Optima unfortunately is much smaller physically, though it has 1000 cranking amps. The Duracell does fit the battery tray perfectly, though it's only 675 cranking amps.
Now the Duracell is behaving strangely compared to other batteries. The smart charger gets it up to about 6.8 volts and it won't go any higher. If I put the old school 10 amp charger on it, it will get up to 7.2 volts, which is where the smart charger would normally terminate. Trying to figure out whether it's having a problem or if this is just how it behaves. I assume it would charge like any other lead-acid battery.