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X728 ups board-Front
X728 ups board-Back
X728 ups board
X728-A1 Packing List
X728-A2 Packing List
X728 PCB Layout


The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header.

It provides 5.1V 8000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown,AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, and a real- time clock.

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/X828/X829 (2.5" HDD/SSD Shield) and X857/X862/X872 (MSATA/M.2 SSD shield) for safe data backup.


  • You must read these safety instructions and warnings before charging your batteries.
  • Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.
  • Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-".
  • Do not mix and use old batteries and new batteries, or batteries with different brand names.
  • Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first.
  • When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended.
  • Must keep the X728 away from children.
  • Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/



  • Raspberry Pi 1 Model B+/ 2 Model B / 3 Model B / 3 Model B+ / 3 Model A+ / 4 Model B


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


X728 18650 UPS + Power management board

  • 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 8000mA 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
  • AC power loss or power adapter failure detection (LED and GPIO detection)
  • On-board pin header allows to select auto power-on when power supplied
  • Automatic safe shutdown when battery low (voltage <3.0V)
  • 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 boards


  • Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A
  • UPS output : 5.1V ±5% Max 8A
  • UPS charging current: 2.3~3.2A
  • Terminal Battery Voltage : 4.24V
  • Recharge Threshold : 4.1V


  • Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
  • Do not use 18650 battery with built-in protection circuit

Packing List

  • X728 Expansion Board x 1
  • Screw M2.5 *5mm x 8
  • Spacer M/F M2.5 *20mm x 4
  • Spacer F/F M2.5 *20mm x 4
  • Jumper link Pitch 2.54mm x 3


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


X728-A2 Optional 18650 2-Cell battery holder

  • Stackable 18650 two cells lithium Ion holder
  • Ideal solution to increase battery capacity
  • Integrated battery protection circuit

User manual


Q1: Why X728 automatically shuts down?

A: 1. X728 will automatic safe shutdown when battery voltage is low than 3.0V, please charge in time;

2. Please try the following operation by step:

  1. Remove all jumper cap,
  2. Remove all 18650 battery
  3. Place 18650 battery again and wait a few seconds before testing

3. What battery is recommended for X728?

A:Because there are so many kind of batteries, and the quality is also various. So we suggest to use the NCR18650B from PANPASONIC. Also do not use 18650 battery with built-in protection circuit for X728.

Q2: We want automatic shutdown when the external AC power supply is disconnected, is possible?

A: Yes. you can program a script to get this function. Example (The following is a pseudo code):

while (1) {
  // invoke the API to get AC PSU status: connected or disconnected
  int disconnected_flag = getACPSUStatus(); 	// please refer to the user manual to achieve getACPSUStatus function;
  int battery_voltage = getBatteryVoltage();    // please refer to the user manual to achieve getBatteryVoltagefunction;
  // You can make your own actions based on disconnected_flag and battery_voltage, you can only select one condition also
  if (disconnected_flag) {
    // execute linux or software shutdown command


Q3: How to restart the pi board when AC Power supply is connected?

A: Please enable 'AUTO POWER ON' or 'AUTO ON' function if you want restart when the AC Power supply is reapplied.

Q4: About auto shutdown, found your board auto shutdown.

A: Please check if enable the ASD function (shorted the ASD header), if you enable the ASD function, please make sure your operation is right: first, place the battery into the battery holder, insert the jumper to ASD header after 3 seconds,this is very important!!

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Anonymous user #6

19 days ago
Score 0++

Hello, your x728 board is excellent!

I was just wondering though how can I get servos to move position when I shutdown when I press the power switch?


20 days ago
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After charging, the battery capacity measurement is no longer correct and only slowly recovers when the Raspberry Pi has been running for a while? Furthermore, the volt measurement shows 3.6 V but the capacity measurement already shows only 5 percent. What could that be?

Anonymous user #7

14 days ago
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I also had this issue, have you found an answer?

Anonymous user #5

one month ago
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Although this device "supports 3A fast charging", how can you configure it to not fast charge? I want to use a battery but it has a max-charge-current of 2.6A.

Anonymous user #5

one month ago
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How much current (max) does the ups draw for charging?

While plugged in, can the device still output over 3amps if the supply is only 3amps?

Anonymous user #4

2 months ago
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Is there a case of the just size?


2 months ago
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Hello sir,Sorry, do design case but you caan use the HAT size acrylic case or N300 for X728, please refer to https://geekworm.com/.


3 months ago
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Is it compatible with X835? https://rasp...iki.com/X835

If so, how it should be powered?


3 months ago
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Hi friend,

Sorry, X728 is not compatible with X835, as the X835 requires 12V power supply.

Anonymous user #3

3 months ago
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Why does the Raspberry Pi turn on and off repeatedly? The power turns on and turns off after 3 seconds, and turns on again. Is it because the battery is not fully charged?

X750 had the same error...


4 months ago
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I'm running https://raspap.com/ to use the Pi as a wireless hotspot. There was an issue with bringing up the wireless interface on RaspberryPi 3B+, if I short the jumper pin for ASD (Auto Shutdown). If I don't short the jumper, it becomes normal.

Has anyone else encountered the same issue?

Anonymous user #2

6 months ago
Score 0++


When do you expect the X728-A1 and X728-A2 boards to be available?

Is there a X728 Case in the pipeline?


5 months ago
Score 0++

Hi friend,

The X728-A1 and X728-A2 will release later in May.

Anonymous user #1

6 months ago
Score 0++
When will this item be released?


6 months ago
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Hi friend, The X728 has just been releasded today, please refer to: https://geek...gement-board Best regards,