1. (a) in constant voltage charging (cycle use): Initial current should be 0.4 CA or smaller (C: rated capacity)
(b) in V-taper charge control system: Initial current should be 0.8 CA or smaller (C: rated capacity)
(c) in constant voltage charging (trickle use): Initial current should be 0.15 CA or smaller (C: rated capacity)

2. Relation between standard voltage value in constant voltage charging and temperature is given in the Table.

(1) when charge current is 0.25 CA or greater: Tch = Cdis / I + (3 to 5)
(2) when charge current is below 0.25 CA: Tch = Cdis / I + (6 to 10)
Where:
Tch : Charging time required (hours)
Cdis : Amount of discharge before this charging (Ah)
I : Initial charge current (A)

Time required for trickle charge ranges from 24 to 48 hours.

d) Reverse charging
Never charge the battery in reverse, as it may cause leakage, heating or bursting of the battery.

e) Overcharging
Overcharge is an additional charge after the battery is fully charged. Continued overcharging shortens the battery life. Select a charge method which is specified or approved for each application.

f) Charging before use
Recharge the battery before use to compensate for capacity loss due to self-discharge during storage.