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
Material
Plastic
Voltage
5 Volts

⏰Real-time clock & safe auto shutdown

⚡5.1V 6A max power output

🔋Lithium-ion 18650 battery support

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VT38967

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Description

🔌 Power your Pi like a pro—never miss a beat!

SMART POWER MANAGEMENT - Intelligent auto power-on, safe shutdown, and power loss detection protect your projects and data.
UNMATCHED POWER BACKUP - Delivers a robust 5.1V/6A output to keep your Raspberry Pi running seamlessly during outages.
VERSATILE COMPATIBILITY - Works flawlessly with Raspberry Pi 5/4B/3B+/3B and integrates with HDD/SSD shields for secure data backup.
BATTERY HEALTH MONITORING - Real-time battery capacity reading and low battery auto shutdown ensure uninterrupted performance.
MODULAR STACKABLE DESIGN - Reserves the 40-pin header for stacking with other Pi accessories—expand your setup without compromise.

The Geekworm X728 V2.3 UPS board is a high-performance power management solution for Raspberry Pi models 3B, 3B+, 4B, and 5. It delivers up to 5.1V at 6A, supports 18650 lithium-ion batteries, and features intelligent power loss detection, auto power-on, safe shutdown, and real-time battery monitoring. Designed for stacking with other Pi accessories, it ensures your projects stay powered and data remains safe during outages.

Specifications

ASIN	B087FXLZZH
Amperage	6 Amps
Battery Cell Composition	Lithium Ion
Battery Cell Type	Lithium Ion
Best Sellers Rank	#1,414,769 in Electronics ( See Top 100 in Electronics ) #342 in Uninterrupted Power Supplies
Brand	Geekworm
Brand Name	Geekworm
Colour	X728
Connector Type	Type-C, DC jack
Customer Reviews	4.2 out of 5 stars 84 Reviews
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
Material	Plastic
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
Product Dimensions	85D x 35W x 64H Millimeters
Runtime	30 hours
Voltage	5.1 Volts
Wattage	30.6 Watts

Reviews

J**R

6.04.2026

E**S

13.11.2025

R**N

17.07.2022

S**N

5.07.2025

M**T

15.04.2026

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VT38967

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

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