CyberPower ST625U
A small standby UPS that suits one desktop PC without a gaming graphics card, or a home network closet.
Amazon $79.95$79.95
The CyberPower ST625U is the better UPS battery backup overall, rated 2.8 to 2.6. The CyberPower ST625U leads on features. The CyberPower ST425 costs $20 less ($59.95 vs $79.95).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
CyberPower ST425
An entry-level standby UPS for a modem, router and a small piece of home networking gear.
Amazon $59.95$59.95
Which should you buy?
- Choose the CyberPower ST625U for features (USB charging, software or network management vs none of the listed features).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every desktop (under 1,000 VA) UPS battery backup; a clear win is highlighted. How we rank explains each one.
| Factor weight | CyberPower ST625U | CyberPower ST425 |
|---|---|---|
| Overall rating | 2.8/5 | 2.6/5 |
| Value 25% | 81 $22.21 per 100 W ($79.95, 360 W) | 79 $23.06 per 100 W ($59.95, 260 W) |
| Output 15% | 7 360 W rated output | 1 260 W rated output |
| Topology and waveform 20% | 0 standby, simulated sine wave | 0 standby, simulated sine wave |
| Runtime 10% | 50 runtime at 100 W not published (neutral score used) | 50 runtime at 100 W not published (neutral score used) |
| Features 15% | 35 USB charging, software or network management | 0 none of the listed features |
| Warranty 15% | 44 3-year warranty, $100,000 equipment guarantee | 40 3-year warranty, $75,000 equipment guarantee |
Specifications
| CyberPower ST625U | CyberPower ST425 | |
|---|---|---|
| Power | ||
| Rated apparent power | 625 VA | 425 VA |
| Rated real power | 360 W | 260 W |
| Topology | Standby | Standby |
| Battery waveform | Simulated sine | Simulated sine |
| Automatic voltage regulation | No | No |
| Outlets and features | ||
| Outlets | 8 (4 on battery) | 8 (4 on battery) |
| Format | Desktop | Desktop |
| Display | LED indicators | LED indicators |
| USB charging ports | Yes | No |
| Data port, software or network option | Yes | No |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Connected-equipment guarantee | $100,000 | $75,000 |