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www.enersys.com
Publication No. US-MP-OM-001
March 2017
17.2.1 Float Charge Method
A float charge is given after the battery has been given its initial charge. To perform a float
charge, follow the procedure below after the battery has been given its initial charge:
1. Determine that the VOLTS PER CELL nominal value is within the 2.23 to 2.27 range.
This can be done by measuring the total battery string voltage and dividing by the
number of cells in the string. Make sure the voltage does NOT exceed the maximum
voltage for the connected load.
2. Adjust the charger to provide the recommended float voltage at the battery terminals.
Do NOT use float voltages HIGHER or LOWER than those recommended. Otherwise
reduced battery life or reduced capacity will result.
3. Check and record battery terminal voltage monthly for accurate calibration.
4. If the VOLTS PER CELL average voltage is above or below the range recommended in
Procedure 1, adjust the charger to provide proper voltage as measured at the battery
terminals.
(When the mP Series cells are new, expect to see variations in float voltage from cell
to cell within a string. These cell voltages should be within ±0.05 volts of the nominal
setting).
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