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

DATA BACKUP READY - Compatible with HDD/SSD and MSATA/M.2 shields for secure, uninterrupted data storage and backup.
SMART SAFETY FIRST - Experience intelligent power management with auto power-on, safe shutdown, and low battery auto-off to protect your data and device.
SEAMLESS STACKABILITY - Reserve the 40-pin header to stack with other Pi accessories, unlocking limitless expansion and enhanced project capabilities.
UNSTOPPABLE POWER BACKUP - Keep your Raspberry Pi running seamlessly with a robust 5.1V 6000mA UPS that handles power outages like a pro.
PRECISION TIMING INCLUDED - Built-in RTC ensures your projects stay on schedule, even during power interruptions.

The Geekworm X728 V2.3 UPS board delivers a powerful 5.1V 6A backup for Raspberry Pi 4B/3B+/3B, featuring intelligent power management with auto power-on, safe shutdown, and real-time clock support. Designed for stacking with other Pi accessories, it ensures uninterrupted operation and secure data backup, making it an essential upgrade for any serious Pi enthusiast or professional.

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Brand	Geekworm
Manufacturer	Geekworm
Model	X728
Product Dimensions	8.5 x 6.4 x 3.5 cm; 60 g
Item model number	X728
Audio Wattage	30.6 Watts
Voltage	5 Volts
Wattage	30.6 Watts
Batteries Included	No
Batteries Required	No
Material	Plastic
Form Factor	Rack
Manufacturer	Geekworm
Item Weight	60 g

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

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