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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 cell motor in cases like those indicated in the table below. In such cases, perform initial charg-
ing before using the battery. Furthermore, initial charging is not required if the terminal voltage*1 ten min-
utes after filling with electrolyte is not less than 12.5 V.
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:
1. 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.
2. Standard Current Charging Time
Set the standard current to the current value indicated as the standard charg-
ing current on the top of the battery. Continue to adjust the standard current
in the same manner.
3. If the terminal voltage is less than 11.5 V, since internal resistance may be high due to long-term stor-
age, charge the battery by following the procedure described below.
It is necessary to adjust the voltmeter so that the standard current flows after five minutes.
Case of charging a battery that has become excessively discharged to less than a battery terminal volt-
age of 11.5 V. Charging may not be possible at the normal charging voltage (16-17 V) due to high inter-
nal resistance. In such cases, initially increase the charging voltage (maximum 25 V), 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.
Note:
Use of the Yuasa Model BM-310 Battery Tester
lets you make a more accurate assessment of bat-
tery performance.
– 26 –
When Initial Charging is Required
Storing at low temperatures in winter (0°C or below)
Storage at high temperatures and high humidity
Filler port seal has been removed or damaged during storage
(when a suction sound cannot be heard when the filler port seal is removed)
Two or more years have elapsed since the manufacturing date
The battery manufacturing date is indicated on the top of the battery.
Example:
01
10
96
31
Day
Month
Year
Production site
Charging Method
2-3 hours using standard current*2
15-20 hours
using standard current
Battery terminal voltage
Charging method
Case of YT4L-BS
Less than 11.5 V*3
20 hours using standard current
20 hours at 0.4 A
11.5 to less than 12.8 V
Charge as indicated on top of battery
5-10 hours at 0.4 A
12.8 V or more
Charging not required
—————
Won’t
flow
Standard current
It is necessary
to adjust the
voltmeter so
that the standard
current flows
after 5 minutes.
Assessment criteria
Assessment
12.8 V or more
Acceptable
12.0 to less than 12.8 V
Insufficient charging Recharge
Less than 12.0 V
Unusable Replace battery
EF3000iSE new model guide 3/14/03 4:20 PM Page 26
