Esp32-c6 battery management

[msfujino]

@Toli

Charging starts at 4.18 V and ends at 4.20 V charging Voltage. The Voltage will drop slightly below this Level (to 4.18 V) when disconnected after charging. If dis- and reconnected, charging will resume until 4.20 V is reached again.

The voltage varies depending on the timing of the measurement. I recommend that you carefully read the following sections of the SGM40567 datasheet.

Figure 4. Charge Profile
Figure 5. Charge Profile
ELECTRICAL CHARACTERISTICS

Maximum Charging Voltage                 4.166   4.20  4.234  V
Output Voltage Fold-Back Holding         95.4    96    96.7   %
Full-Charge Voltage Detection Threshold  97      98.5   -     %

Not ESP32C6, but for your information.

Charging characteristics of XIAO_nRF52840 and XIAO_ESP32C3

XIAO_nRF52840 and XIAO_ESP32C3 have a built-in charging function, but since the circuit diagram was not disclosed, I assumed that they have the same circuit. I was curious and measured the charging characteristics. They are completely different, XIAO_nRF52840’s charging current can be set to 50mA or 100mA by firmware, but XIAO_ESP32C3’s is fixed and very large at 370mA, so I need to be very careful when using small capacity batteries. [XIAO_Charge]