Is the battery replaceable? What type? It looks like it's soldered on.

It is NOT a capacitor. It is a CR1025 lithium cell with solder tabs (not easy to find!) DO NOT attempt to solder wires directly to a battery--it might explode! Cheers es 73, NV1T Tom

If you have power loss, does the real-time clock retain the correct time, i.e., does it have battery backup?

It is NOT a capacitor; it's a CR1025 lithium cell with solder tabs. Yes, the battery will retain the correct time in the absence of power. There is a tiny but measurable current drain, so the battery will eventually die, and it is NOT a rechargeable type. Cheers es 73, NV1T Tom

Is this compatible with the esp8266?

It is an I2C device and the esp8266 has I2C capability so it will work with the appropriate firmware.

Pictures dont show wiring diagram, wheres it at?

It's an I2C device. The pins are labeled thus: Label Meaning ------ --------- + Vcc (5V) D SDA C SCL NC (No Connection) - Ground Cheers es 73, NV1T

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⏳ Never Miss a Beat with Precision Timing!

BUILT FOR RELIABILITY - Features reset output and anti-shake input for dependable performance.
STAY ON TIME EVERY TIME - Experience unparalleled accuracy with the DS3231 RTC module.
VERSATILE VOLTAGE OPTIONS - Compatible with both 3.3V and 5V systems for ultimate flexibility.
LIGHTNING FAST COMMUNICATION - Enjoy high-speed data transfer with a 400 KHz I2C serial bus.
TEMPERATURE TRACKING MADE EASY - Monitor your environment with a digital temperature sensor accurate to ±3°C.

The HiLetgo 5pcs DS3231 High Precision RTC Real Time Clock Module is designed for Arduino and Raspberry Pi enthusiasts, offering exceptional accuracy and reliability in timekeeping. With dual calendar clock functionality, it operates at both 3.3V and 5V, features a high-speed 400 KHz I2C serial bus, and includes a digital temperature sensor with a precision of ±3°C.

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