$62.50
425 VA / 255 W15 min
2.6/5
An entry-level standby UPS for a modem, router and a small piece of home networking gear.
- 425 VA / 260 WOutput
- Standby, Simulated sineType
- 8 (4 on battery)Outlets
Check price at Amazon$59.95
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Cheapest way to keep a router and modem up through a short outage
- Four more outlets with surge protection only, for the printer or lamp
- 3-year warranty includes the battery
Cons
- 260 W is enough for a modem, router and a laptop dock, not a desktop PC with a monitor
- Simulated sine wave and no voltage regulation
The CyberPower ST standby family
Every CyberPower ST standby model we rank, smallest first. Ratings compare each against its own size.
| Model | Output | Rating | Price |
|---|---|---|---|
| CyberPower ST425 (this one) | 425 VA / 260 W | 2.6/5 | $59.95 |
| CyberPower ST625U | 625 VA / 360 W | 2.8/5 | $79.95 |
| CyberPower ST900U | 900 VA / 500 W | 2.9/5 | $119.95 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | ST425 |
|---|---|
| Power | |
| Rated apparent power | 425 VA |
| Rated real power | 260 W |
| Topology | Standby |
| Battery waveform | Simulated sine |
| Automatic voltage regulation | No |
| Outlets and features | |
| Outlets | 8 (4 on battery) |
| Format | Desktop |
| Display | LED indicators |
| USB charging ports | No |
| Data port, software or network option | No |
| Warranty | |
| Warranty | 3 years |
| Connected-equipment guarantee | $75,000 |
Alternatives in this size
$87.96
800 VA / 450 WStandby
Vertiv Liebert PowerUPS 100 PUL-350LVT
A small lithium standby UPS for hot closets and network gear, with a 5-year warranty.
Amazon $139.99$139.99
350 VA / 210 WStandby
Compare
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