Is the recharge threshold and terminal battery voltage adjustable? I want to keep the batteries between 80% and 20%

No. I don't think this is possible, unlesss you write a script that monitors the voltage or % of charge, and open a relay that would cut off the power input to the system... You would need some external equipment (arduino?) for that.

Are the batteries hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?

Hi friend, Sorry that the X728 on board 18650 batteries does not support hot-swappable, please swap the batteries after power cut off. best regards, Geekworm Team

Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?

Hi friend, The RTC function runs on the 18650 batteries. It will "lose" time if you remove the 18650 batteries. best regards, Geekworm Team

Can I use more than two batteries with the x728?

It holds two batteries, it does have an second input for more battery boards.

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Geekworm for Raspberry Pi UPS, X728 (Max 5.1V 6A) UPS & Power Management Board with AC Power Loss Detection|Auto Power On|Safe Shutdown|Battery Capacity Reading|Low Battery Auto Shutdown|Buzzer

Geekworm for Raspberry Pi UPS, X728 (Max 5.1V 6A) UPS & Power Management Board with AC Power Loss Detection|Auto Power On|Safe Shutdown|Battery Capacity Reading|Low Battery Auto Shutdown|Buzzer

Product ID: 371701206

Details

Battery cell composition
Lithium Ion
Brand
Geekworm
Colour
X728
Product dimensions
85D x 35W x
Voltage
5.1 Volts

⏰Real-time clock & safe auto shutdown

⚡5.1V 6A max power output

🔋Battery capacity reading & management

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Description

🔌 Power your Pi like a boss — never lose a beat, never lose your edge.

STACKABLE SCALABLE - Reserve the 40-pin header to stack with other Pi accessories, enabling powerful, modular setups for advanced projects.
BUILT IN SAFETY ALERTS - Stay informed with buzzer alarms and AC power loss detection, ensuring you never miss a critical power event.
PLUG PLAY AUTO POWER ON - Experience hassle-free startup with auto power-on and full software-controlled poweroff for ultimate control.
SMART BATTERY INTELLIGENCE - Monitor battery capacity in real-time and enjoy automatic low-battery shutdown to protect your data and hardware.
UNINTERRUPTED POWER ALWAYS - Keep your Raspberry Pi running seamlessly with 5.1V/6A power backup that handles power loss like a pro.

The Geekworm X728 UPS board delivers robust 5.1V/6A power backup for Raspberry Pi models 3B+ and above, featuring intelligent battery management, safe auto shutdown, and real-time capacity monitoring. Designed for seamless stacking with other Pi accessories, it ensures uninterrupted operation during power outages, protects your SD card from corruption, and supports advanced data backup shields. Ideal for professionals demanding reliable, portable, and scalable Pi power solutions.

Specifications

ASIN	B087FXLZZH
Amperage	6 Amps
Battery Cell Type	Lithium Ion
Best Sellers Rank	#93,363 in Computers ( See Top 100 in Computers ) #137 in Computer Uninterruptible Power Supply Units
Brand	Geekworm
Color	X728
Connector Type	Type-C, DC jack
Customer Reviews	4.2 4.2 out of 5 stars (84)
Enclosure Material	Plastic
Form Factor	Rack
Input Voltage	5 Volts
Item Dimensions	8.5 x 6.4 x 3.5 centimeters
Item Dimensions D x W x H	85D x 35W x 64H millimeters
Item Weight	0.06 Kilograms
Manufacturer	Geekworm
Maximum Power	30.6 Watts
Mfr Part Number	TB-2019-71
Model Number	X728
Number of Outlets	1
Output Current	6 Amps
Output Voltage	5.1 Volts
Output Wattage	30.6 Watts
Power Plug Type	No Plug
Runtime	30 hours
Unit Count	1 Count
Voltage	5.1 Volts
Wattage	30.6 watts

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