F-Li Series–Line Interactive UPS (220W–330W) with LiFePO₄

· CPU controlled

· Auto re-starts when AC recovers

· Automatic charging (offline charging)

· Overload & short circuit protection

· Wide input voltage range

· Long life cycles, long backup time

· Built-in LiFePO4 lithium battery

· Light weight and small size cabinet design

· Support PC and NAS communication, provide shutdown management and protection

The Tiny Lithium Backup That Saves Your Files and Your Patience

You know exactly how it goes. You're working from home, the deadline is tight, and a thunderstorm rolls through. The lights flicker for half a second—just enough to make your router reboot, your NAS drop offline, and your desktop shut down without saving that document you'd been working on all morning. A heavy, lead-acid UPS would solve the problem, but it feels like overkill: something that belongs in a server room, not next to your desk. The F-Li Series flips that equation. It's a line-interactive UPS that's genuinely small and light enough to tuck behind a monitor or sit on a shelf, because it doesn't use a lead-acid battery at all. Inside is a lithium iron phosphate (LiFePO4) pack—the same chemistry that powers solar home batteries and electric buses—packed into a unit no bigger than a thick book.

Lithium Where It Finally Makes Sense

Lead-acid batteries have been the default for small UPS units for decades, and they're not great at the job. They're heavy, they don't like being cycled, and they lose capacity noticeably after a couple of years. You end up with a 5-kilogram brick on your desk that gives you maybe five minutes of backup time and needs a new battery every two years. The F-Li's LiFePO4 cells change all of that. They're light enough that you can pick the whole UPS up with one hand and move it without swearing. They're small, so the cabinet doesn't eat up your desk space or demand a dedicated shelf. And because lithium chemistry can handle thousands of charge-discharge cycles—not just a few hundred like lead-acid—you're not pencilling in a battery replacement every other year. The backup time, watt for watt and litre for litre, is substantially longer. For the modem, router, and NAS that keep your digital life running, that's the kind of set-and-forget reliability you actually want.

Line-Interactive with a Brain

The F-Li isn't a dumb battery box. It's a line-interactive UPS with a CPU controller that actively manages what's happening with your power. When the grid sags or swells, the automatic voltage regulation (AVR) kicks in to correct the voltage without touching the battery. That saves your battery for real blackouts and stops it from cycling itself to death during a brownout. When the power does go out entirely, the transfer to battery happens fast enough that your desktop doesn't reboot and your router doesn't drop its connection. When grid power comes back, the UPS auto-restarts—no button pressing, no trip to the basement. There's also a feature most people only discover they need when it's too late: offline charging. Plug the UPS into the wall but leave it switched off, and the battery still charges. If you use the UPS seasonally, or you're setting up equipment and want it fully juiced before powering anything on, that's a small convenience that makes a big difference.

Protections That Don't Nag You

Overload and short-circuit protection are built in and work silently in the background. The input voltage window is wide, so the UPS doesn't panic and flip to battery every time the fridge compressor kicks on or the utility voltage wobbles. It stays on utility power through the kind of minor fluctuations that happen daily in most homes and small offices. The result is less beeping, less battery wear, and less attention demanded from you.

Talks to Your NAS and PC So You Don't Lose Data

This is the feature that turns the F-Li from a simple backup box into a genuine data-protection device. Via a USB connection, the UPS can communicate directly with your computer or, more importantly, your NAS. If you're running a Synology, QNAP, or similar network-attached storage device, the F-Li tells it exactly what's happening with the power. When an outage hits and the battery starts to run low, the UPS sends a signal that tells the NAS to shut down gracefully—saving open files, stopping disk writes, and parking the drives safely. No corrupted file systems, no lost RAID arrays, no hours of rebuilding because the power cut out while the NAS was writing to disk. For a home office or a small business that stores client files, family photos, and critical documents on a NAS, that automatic shutdown management is the whole reason to buy a UPS. The F-Li does it natively, without any tricky configuration or third-party software.

Where It Lives

The F-Li is designed for the spots where a traditional UPS feels too big, too heavy, or too much like industrial equipment:

`Next to your home router and modem: The most common home power annoyance is a brief flicker that reboots the router, drops your video call, and takes two minutes to reconnect. The F-Li stops that cold.

`Under your desk with your desktop PC: Enough runtime to save your work and shut down properly, without a giant tower taking up your legroom.

`In a small network closet: Protecting a NAS and a PoE switch that run security cameras or a home lab.

`Freelancer and small business desks: Where a single corrupted file or a lost hour of work because of a power blip is unacceptable.

Small, Smart, and Stuffed with Lithium

The F-Li Series Line Interactive UPS doesn't try to power a server rack. It's built for the quiet, critical equipment that keeps a modern home office alive: the router, the NAS, the PC that holds your work. By swapping heavy, short-lived lead-acid batteries for a built-in LiFePO4 pack, it shrinks the footprint, extends the lifespan, and boosts the runtime. The CPU-controlled AVR keeps voltage steady without wasting battery cycles, the auto-restart and offline charging make it genuinely fit-and-forget, and the USB communication with your NAS means your data is safe even when the grid isn't. If you're tired of losing work and waiting for routers to reboot, this is the little lithium box that puts an end to it.