• The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header.
• Compatible with Raspberry Pi 5/ Pi 4 / Pi 3B+/ 3 B + / 3 B / 3 A+ / 2 B
• It provides 5.1V 8000mA Power Backupfor even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown, auto power-on, full poweroff from software, battery reverse polarity protection circuit, and a real- time clock.The script must be installed first for the product to work properly.
• The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 can also be used with the X825 (2.5" HDD/SSD Shield) and X857 / X862 (MSATA/M.2 NGFF SSD shield) for safe data backup.

[User Manual]

• wiki.geekworm.com/X728

[OPERATING SYSTEM]

• Raspbian Stretch

• Safe shutdown function tested for Raspbian, other operating systems to be tested and advise

[Specification]

• Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A

• UPS output : 5.1V ±5% Max 6A

• UPS charging current: 2.3~3.2A

• Terminal Battery Voltage : 4.24V

• Recharge Threshold : 4.1V

[X728]

• Smart and powerful Uninterruptible Power Supply (UPS)

• Provides continuous operations for up to 10~30hours (depending on battery type and qty used)

• Max 5.1V 6000mA Power Backup for even the most demanding RPi set ups

• Can work with X728-A2 stackable 2-cell battery holder to increase battery capacity

• Supports 3000mA fast battery charging

• Integrated over current protection and over voltage protection

• Integrated Maxim's fuel-gauge systems (Reading battery voltage and percentage via i2c)

• Integrated 10-A fully-integrated synchronous boost converter

• Intelligent automatic charging and discharging

• On-board 4 green LEDs indicate battery charging and discharging levels of 25%, 50% , 75% and 100%

• Intelligent and safe power management

• Equipped with momentary button for easy power control

• Press the button to turn on

• Press the button and hold for 1~2seconds to reboot

• Press the button and hold for 3~7seconds to implement safe shutdown

• Press the button and hold for >8seconds to force shutdown

• Supports safe shutdown and full poweroff through software

• On-board blue LED shows the status of power on, reboot and shutdown

• On-board pin header allows to select auto power-on when power supplied

• Ultra-low standby power consumption to maximize battery life

• Operate in both charge mode and boost mode to allow full system management and battery power management

• Integrated IN-to-SYS pass-through path to pass the input voltage to the system

• Advanced system power-path management avoids batteries frequent charging and discharging

• Advanced system power-path management allows 3A fast charging and powering Raspberry Pi at the same time

• Integrated Hardware DS1307 Real Time Clock (RTC) with Battery Back-Up

• Keeps track of the time while the Raspberry Pi is switched off

• Allows the Raspberry Pi to retrieve the current date and time when it is switched back on

• Uses the 18650 battery to maintain the date and time - no additional battery required

• Powers the Raspberry Pi via the 40-pin header - no additional cabling required

• On-board DC power jack (5.5*2.5mm) and Type-C socket convenient for power input

• On-board PH2.0 connector allows to connect external power switch and DIY your perfect case

• On-board XH2.54 power output connector allows to power other devices

• Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory board

[X728-A1]

• X728-A1 Optional Raspberry Pi cooling fan

• Completely solve the overheating problem of your Raspberry Pi

• Efficient drop temp of your Raspberry Pi by using the X728-A1

• Stackable design allows you to connect both X728 and X728-A1on your Raspberry Pi

• On-board XH2.54 power output connectors allow to power other devices

• Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards