well made, fully functional and sent with a CR2032 battery, there is a problem. A CR2032 CAN'T BE charged and there is a overheating risk and explosion risk. Using a LIR2032 isn't a better way because the charging circuit is always on. So disable the charging circuit by desoldering the diode or the resistor as I did (picture 1). If you want to to test the voltage battery, add a pin to the + battery (picture 2) and don't directely connect the battery to a microcontroller !. Used with a Arduino Nano and when i had cutted the power supply to test the DS3231, I noticed that the Arduino was powered by the battery powered and discharged it. After I added a TL071, as unity gain buffer (picture 3) with offset adjustment between the battery and the the Arduino, all worked well (picture 4 and 5).

well made, fully functional and sent with a CR2032 battery, there is a problem. A CR2032 CAN'T BE charged and there is a overheating risk and explosion risk. Using a LIR2032 isn't a better way because the charging circuit is always on. So disable the charging circuit by desoldering the diode or the resistor as I did (picture 1). If you want to to test the voltage battery, add a pin to the + battery (picture 2) and don't directely connect the battery to a microcontroller !. Used with a Arduino Nano and when i had cutted the power supply to test the DS3231, I noticed that the Arduino was powered by the battery powered and discharged it. After I added a TL071, as unity gain buffer (picture 3) with offset adjustment between the battery and the the Arduino, all worked well (picture 4 and 5).

well made, fully functional and sent with a CR2032 battery, there is a problem. A CR2032 CAN'T BE charged and there is a overheating risk and explosion risk. Using a LIR2032 isn't a better way because the charging circuit is always on. So disable the charging circuit by desoldering the diode or the resistor as I did (picture 1). If you want to to test the voltage battery, add a pin to the + battery (picture 2) and don't directely connect the battery to a microcontroller !. Used with a Arduino Nano and when i had cutted the power supply to test the DS3231, I noticed that the Arduino was powered by the battery powered and discharged it. After I added a TL071, as unity gain buffer (picture 3) with offset adjustment between the battery and the the Arduino, all worked well (picture 4 and 5).

The quality of the products seem good. The modules come even with battery and that’s good.

The quality of the products seem good. The modules come even with battery and that’s good.

The quality of the products seem good. The modules come even with battery and that’s good.