That is not how a Float Charger works. A Float Charger is a constant voltage, current limit device. The current limit can be as high or low as you want within tolerance of the battery charge acceptance. Grabbing numbers out of the sky lets say you have a 10 volt 10 AH battery, and a 10 volt 1 amp float charger. So let's say the battery is completely discharged and you connect the charger. For about 10 hours the charger will supply 1 amp until th ebattery terminal voltage reaches 10 volts. At that point the current twill taper off toward zero amps after another couple of hours of a saturating charge, aka Absorb. The charger will hold the battery at 10 volts supplying only enough current to over come the self discharge current of the battery.
This is the basic operation of any Stand-By Battery service which is exactly what, UPS, utilities, and telephone companies use on their battery plants. It is the kindest most gentle charger there is and provides the maximum battery life. It only has one disadvantage of being slow to recharge. A 3-stage from dead to full is around 16 hours with a C/10 charge current. Float with C/10 will be around 20 to 24 hours.
Note Telcos, utilities, and UPS use much higher charge currents in excess of 1C. But they do not use the same kind of batteries you do.
This is the basic operation of any Stand-By Battery service which is exactly what, UPS, utilities, and telephone companies use on their battery plants. It is the kindest most gentle charger there is and provides the maximum battery life. It only has one disadvantage of being slow to recharge. A 3-stage from dead to full is around 16 hours with a C/10 charge current. Float with C/10 will be around 20 to 24 hours.
Note Telcos, utilities, and UPS use much higher charge currents in excess of 1C. But they do not use the same kind of batteries you do.
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