This module uses HY2120CB as the core to realize over-discharge protection and over-charge protection for dual-cell series lithium batteries . When discharging: When the lithium battery is discharged to about it will no longer discharge to prevent over-discharge; when charging: When the lithium battery is charged to about 8.4V, it will no longer be charged to prevent overcharging. Note: Overcharging/over-discharging is very harmful to lithium batteries and will cause them to heat up, burn or be scrapped.
| symbol | describe |
| P1 | 7.4V lithium battery input terminal (B-, BM, B+) |
| P2, P3 | B-, B+ input terminal (6V~8.4V) |
| button | Just connect the battery, press the button to activate the over-discharge protection chip |
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