Don't know the exact theory.
Well yes, but as I said they'll be straight off the charger.
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20 years ago
Installed new battery backup for home alarm
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20 years ago
Not always.
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20 years ago
You can't really "charge those at constant voltage", if you applied a constant voltage source of 13.8 volts to a discharged battery you would get a very high current flowing which could damage the charger and/or the battery. All battery chargers current limit by some means or another. If designed correctly they current limit at a level which will neither charge the battery too fast nor damage the charger. Then, when the battery approaches full charge, they become constant voltage sources of 13.8 volts (hopefully temperature compensated) and keep the battery charged with a 'float' charge.