The trickle charging current is one tenth of the constant current charging current, which is 0.1C e.g. for a constant charging current of 1A, the trickle charging current is 100mA). (C is a way of expressing the nominal capacity of the cell against the current. If the cell has a capacity of 1000mAh, 1C is the charging current of 1000mA.)
A trickle charge circuit can be made using a cheap wall cube as the DC source, and a single power resistor to limit the current. NI-MH: Ni-MH cells are not as tolerant of sustained charging: the maximum safe trickle charge rate will be specified by the manufacturer, and will probably be somewhere between c/40 and c/10.
It should stay in the trickle charge current level until the battery simulator voltage reaches a safe level (i.e. 3.2V), depend on the charger design. At this point the charger should start rapid charging with a normal current, typically about 1C. 1C is referring to the charging current being the same as the battery capacity.
The maximum rate of trickle charging which is safe for a given cell type is dependent on both the battery chemistry and cell construction. When the cell is fully charged, contin-ued charging causes gas to form within the cell.
At low battery voltage (below 3.2 volts), it needs to be trickle-charged with a low current. The battery is can’t handle a higher charging current when the voltage is too low, so for safety reasons the trickle-charge current is typically one-tenth of normal.
To test the charger, change the DC OFFSET control to change the emulated voltage while recording of the charging current. Move the output voltage of the simulator from low-to-high and high-to-low to show how the charger reacts to the changes. A charger must also be able to charge a completely drained battery.
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