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

5pcs Ds3231 High Precision Rtc Real Time Clock Module 3

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Description

⏳ Stay perfectly synced, always on time, and ahead of the curve!

RELIABLE POWER BACKUP - Built-in battery backup guarantees uninterrupted real-time clock even during power loss.
ROBUST RESPONSIVE INTERFACE - High-speed 400 KHz I2C bus with anti-shake input for glitch-free communication.
PRECISION THAT KEEPS YOU AHEAD - Ultra-accurate ±5 PPM timing ensures your projects never miss a beat.
PLUG PLAY VOLTAGE FLEXIBILITY - Seamlessly supports both 3.3V and 5V systems—no level shifters needed.
SMART CALENDAR WITH LEAP YEAR SUPPORT - Complete date and time tracking with leap year compensation through 2100.

The HiLetgo DS3231 RTC Module offers ultra-precise real-time clock functionality with ±5 PPM accuracy, battery-backed continuous timing, and full calendar features including leap year compensation until 2100. Compatible with both 3.3V and 5V systems, it communicates via a high-speed 400 KHz I2C bus and includes anti-shake input for stable performance, making it an essential component for professional-grade Arduino and Raspberry Pi projects.

Specifications

ASIN	B01N1LZSK3
Batteries	1 CR2 batteries required. (included)
Best Sellers Rank	#132,864 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #16 in Semiconductor Timing Management Products
Date First Available	November 28, 2016
Item Weight	0.317 ounces
Item model number	3-01-1198
Manufacturer	HiLetgo
Package Dimensions	3.62 x 3.15 x 0.91 inches

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E£ 2543

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Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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5pcs DS3231 High Precision RTC Real Time Clock Module 3.3V/5V for Arduino Raspberry Pi

Description

Specifications

Common Questions