Assuming a typical 65Ah starting battery is already fully-charged, driving 2A constant-current through it will get the terminal voltage up to 16+V in a couple of hours. A typical equalization cycle is ~8h, during which the cells bubble lightly.I don't know where you got 1 amp per 35Ah number from. The recommended charge rate for most flooded batteries is 10% of C, (C = Ah rating). At 1 amp per 35Ah or 3% of C you could not get most batteries to up to absorption termination voltage let alone raise it to the equalization voltage.
I said nothing about charging current. I am talking ab0ut the current that flows into the battery only during the "equalization" cycle. Most starting batteries will accept the entire output of the alternator (35A to 65A) during charging. Charging limits like 0.25C apply mostly to sealed batteries.MikeML
I agree with what you have said except on the charge current. Even starting verses deep-cycle batteries, the difference in charge current is not that much. 2 amps is the standard charge rate for a motorcycle battery. 10 amps for a car battery. 20 amps for a Trojan or a Crown deep-cycle RV battery.
Yes, by an order of magnitude... Take a previously fully-charged 12V battery. Connect a lab power supply with the voltage limit set to 20V or higher, set the current limit to 2.0A, connect across battery. Measure battery terminal voltage 2 hours or more hence. Voltage will climb to >16V. Equalization is what happens while battery voltage is >2.6V per cell (15.6V for a six cell battery)Do you think the current required to reach, and hold at, the equalization voltage, is less than the current required to charge it? ....................
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by Jake Hertz