1. Charging
The safe operating voltage range for lithium batteries is 2.8~4.2V. Below or above this range, the lithium ions in the battery become very unstable, potentially causing accidents. To ensure the battery operates within this safe range, a dedicated charger is required. These chargers automatically adjust the charging method based on the battery's current state.
2. Activate
Before a lithium charger starts charging, it supplies a small current to the battery while simultaneously detecting changes in battery voltage, and gradually increases the current until it reaches the set value. This process can be considered an activation or test charging.
3. Constant current transformer charging
The charger charges the battery with a constant current. As the battery voltage increases, the charger simultaneously increases the charging voltage to speed up the charging process.
4. Variable current constant voltage charging
When the battery reaches the 4.2V cutoff voltage, it has only been charged to about 70% (not fully charged). At this point, the charger continues to charge the battery with a constant voltage and a gradually decreasing current, stopping charging only when the current is less than 0.1A and the charger detects that the battery voltage is still rising.
