CyberPower ST900U
A standby UPS for a mid-range desktop PC when you do not need AVR or an LCD.
Amazon $119.95$119.95
900 VA / 500 WStandby, Simulated sine
2.8/5
A small standby UPS that suits one desktop PC without a gaming graphics card, or a home network closet.
- 625 VA / 360 WOutput
- Standby, Simulated sineType
- 8 (4 on battery)Outlets
Check price at Amazon$79.95
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Two USB ports charge a phone from the same box
- Management software lets a PC shut itself down safely
- 3-year warranty includes the battery
Cons
- Simulated sine wave and no voltage regulation
- Only four of the eight outlets run on battery
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 | 425 VA / 260 W | 2.6/5 | $59.95 |
| CyberPower ST625U (this one) | 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 | ST625U |
|---|---|
| Power | |
| Rated apparent power | 625 VA |
| Rated real power | 360 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 | Yes |
| Data port, software or network option | Yes |
| Warranty | |
| Warranty | 3 years |
| Connected-equipment guarantee | $100,000 |
Alternatives in this size
$89.95
700 VA / 370 WStandby, Simulated sine
Compare
Compare the CyberPower ST625U with any other UPS battery backup →
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