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 Raspberry Pi UPS, X728 V2.3 (Max 5.1V 6A) 18650 UPS & Power Management Board with Power Loss Detection, Auto On & Safe Shutdown Function for Raspberry Pi 4B/3B+/3B

Geekworm Raspberry Pi UPS, X728 V2.3 (Max 5.1V 6A) 18650 UPS & Power Management Board with Power Loss Detection, Auto On & Safe Shutdown Function for Raspberry Pi 4B/3B+/3B

Product ID: 600823327

Details

Battery Cell Composition
Lithium Ion
Brand
Geekworm
Colour
X728
Product Dimensions
85D x 35W x
Voltage
5.1 Volts

⏰Built-in RTC & safe auto shutdown

⚡Max 5.1V 6A output power

🔋Supports 18650 Li-ion battery backup

₪575

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Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power your Pi like a pro—never miss a beat with Geekworm X728 UPS!

STACK EXPAND - 40-pin header reserved for stacking with other Pi accessories—future-proof your projects effortlessly.
ROBUST 6 A OUTPUT - Delivers a stable 5.1V at up to 6A, powering even the most demanding Raspberry Pi setups.
DATA BACKUP READY - Compatible with HDD/SSD shields for secure, uninterrupted data storage and backup.
POWER UP WITHOUT FEAR - Seamless auto power-on & safe shutdown protect your Pi from unexpected outages.
SMART BATTERY MANAGEMENT - Monitors battery capacity with low-battery auto shutdown and buzzer alerts to keep you informed.

The Geekworm X728 V2.3 UPS board is a high-performance power management solution for Raspberry Pi 4B/3B+/3B, delivering up to 5.1V 6A output with intelligent battery backup using 18650 Li-ion cells. Featuring auto power-on, safe shutdown, real-time clock, and compatibility with HDD/SSD expansion shields, it ensures uninterrupted operation and data safety for professional-grade Pi projects.

Specifications

ASIN	B087FXLZZH
Amperage	6 Amps
Battery Cell Type	Lithium Ion
Best Sellers Rank	#58,999 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #158 in Uninterrupted Power Supplies
Brand Name	Geekworm
Colour	X728
Connector Type	Type-C, DC jack
Country of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (85)
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 Unit of Measure	0.06 Kilograms
Manufacturer	Geekworm
Manufacturer Part Number	TB-2019-71
Maximum Power	30.6 Watts
Model Number	X728
Number of Outlets	1
Output Current	6000 Milliamps
Output Voltage	5.1 Volts
Output Wattage	30.6 Watts
Power Plug Type	No Plug
Runtime	30 hours
Voltage	5.1 Volts
Wattage	30.6 Watts

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