SunFounder PiPower
Charging Power
Under the power-on state, the charging current will automatically adjust based on the input voltage.
Table 2: Charging Current Logic
Switch Charging Current
On Adjusted based on input voltage
Off 2A
1. When the switch is in the “Off” state, PiPower Pro does not supply power externally, and the charging current
reaches a maximum of 2A, allowing for fast charging. The charging time from 0% to 100% is approximately 2
hours and 10 minutes.
2. In the “On” state, since PiPower Pro needs to supply power externally, the external USB also needs to provide
power to the battery. To ensure the voltage of the USB power supply remains stable, the charging current is
adjusted based on the input voltage, ensuring the voltage stays above 4.6V.
Over-discharge Protection
When the single battery voltage is below 3V, the battery protection activates and the battery is no longer discharged.
When the battery is unplugged, due to the mechanism of the on-board over-discharge protection circuit, the voltage will
be considered too low, thus activating the protection circuit; when you replug the battery into the PiPower, the battery
will not work properly, at this time, you need to plug the Type C cable into the charging port to turn off the protection
circuit, and the battery can be used normally.
Overcharge Protection
Charging ends when the total battery voltage reaches 8.4V.
Charge Balance
When the voltages of the two batteries are not equal, the charging current of the two batteries is automatically adjusted
to balance the two batteries.
When a single battery exceeds 4.2V, the voltage divider resistor channel conducts and the battery charging current is
reduced or even discharged.
Battery
The product comes with two 3.7V 18650 lithium-ion batteries in series, featuring an XH2.54 3P connector, with a
nominal capacity of 2000mAh.
• Composition: Li-ion (Lithium-ion)
• Capacity: 2000mAh, 14.8Wh
• Weight: 90.8g
• Cells: 2
• Connector: XH2.54 3P
• Overcharge Protection Voltage: 4.2V per cell
• Over-discharge Protection: 3V
External Battery
3.1. Detailed Introduction 15
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