Yamaha EF4500iSE Theory & Diagnostics Manual page 23

Battery Initial Charging Procedure
1. Cases in which Charging of a New Battery is Required (Initial Charging)
Although the Sealed Motorcycle MF Battery can be used after it is filled with electrolyte, it may not be able
to start a motor in cases like those indicated in the table below. In such cases, perform initial charging
before using the battery. Furthermore, initial charging is not required if the terminal voltage (*1) ten minutes
after filling with electrolyte is not less than 12.5V.
2. Initial Charging Procedure
Although the procedure for initial charging of the Sealed Motorcycle MF Battery is based on the charging
procedure indicated on the top of the battery, it is recommended to determine the duration of initial charg-
ing based on the terminal voltage.
NOTE:
a. Terminal Voltage
Use a digital voltmeter (or voltmeter of class 1 accuracy or better) to mea-
sure battery terminal voltage. Continue to measure terminal voltage in the
same manner.
b. Standard Current Charging Time
Set the standard current to the current value indicated as the standard
charging current on the top of the battery.
If the terminal voltage is less than 11.5V, internal resistance may be high
due to long-term storage, charge the battery by following the procedure.
It is necessary to adjust the voltmeter so that the standard current flows
after five minutes. Charging a battery that has become excessively discharged to less than a battery ter-
minal voltage of 11.5V charging may not be possible at the normal charging voltage (16~17V) due to high
internal resistance. In such cases, initially increase the charging voltage (maximum 25V), and then charge
for about 5 minutes. (The battery must be replaced if there is no change in the voltmeter reading (A) after
5 minutes.) Since excessively high current will flow once the current begins to flow, always make sure to
adjust the voltage of the charger so as not to exceed the standard current. This initial charging procedure
can be performed automatically by using the Yuasa MF Battery Charger (such as model PS1512).
3. Assessing Battery Performance After Initial Charging
Assessment of battery performance following charging of the Sealed Motorcycle MF Battery should be
made by measuring battery terminal voltage after allowing the battery to stand for about 30 minutes fol-
lowing completion of charging.
Generator Information and Theory
NOTE: Use of the Yuasa Model BM-310 Battery
Tester lets you make a more accurate assess-
ment of battery performance.
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YT4L-BS