Take discharging at an ambient temperature of -20℃ to +35℃.
The capacity to hold a charge may not be recovered if the battery is left discharged for a
long period.
The battery should be immediately recharged if discharged deeply and or after using it.
The discharge capacity is affected by the discharge current. Evidently, increasing
discharge current causes decrease in the capacity, decreasing discharge current causes
increase in the capacity. ( Refer Figure 1. )
4.3 Charge
4.3.1 CONSTANT VOLTAGE CHARGE (Recommend to use constant voltage charger)
This type of charging generally employs a constant voltage constant current method with
current limitation to prevent the initial current from increasing, using a charger which
controls electric current by transistor.
As a lot of electric current needs during charging of initial current to the middle current,
electric current redcoats rapidly because being charge constant voltage at the last period of
charging.
At the last period of charging, keeps to charge constant voltage with reduced electric
current rapidly.
The setting value of constant voltage Is 2.4 Volt/Cell for cycle service.
The zone between 2.24 Volt/cell and 2.28 Volt/Cell are adopted for float charging.
The 2.23 Volt/Cell is a minimum charge value in order to maintain battery capacity after
fully charging.
Figure 3. Characteristics of constant voltage charging
Note : A charge quantity of 120% of discharge quantity is needed to fully charge the battery
a. Float charge
? Keep charging constant voltage with 2.23 Volt - 2.28 Volt/Cell at 25℃
Numeral value of temperature ; Vc, t = Vc, 25- 0.00033 ( t - 25 )
Vc,t ; Charging voltage at t℃
Vc. 25 ; Charging voltage at 25℃
? Initial current charging Is below 0.4 C
C : Nominal capacity A : Ampere
Ex) In case of 100 AH as battery capacity : 100 × 0.4 = 40 A
