CyberPower EC850LCD
A desktop UPS with an LCD and power-saving outlets, for a home office PC with peripherals.
Amazon $119.95$119.95
The CyberPower EC850LCD is the better UPS battery backup overall, rated 3.2 to 2.9.
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 ST900U
A standby UPS for a mid-range desktop PC when you do not need AVR or an LCD.
Amazon $119.95$119.95
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 EC850LCD | CyberPower ST900U |
|---|---|---|
| Overall rating | 3.2/5 | 2.9/5 |
| Value 25% | 78 $23.52 per 100 W ($119.95, 510 W) | 77 $23.99 per 100 W ($119.95, 500 W) |
| Output 15% | 17 510 W rated output | 16 500 W rated output |
| Topology and waveform 20% | 50 topology and waveform not published (neutral score used) | 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% | 40 LCD, software or network management | 35 USB charging, software or network management |
| Warranty 15% | 44 3-year warranty, $100,000 equipment guarantee | 47 3-year warranty, $125,000 equipment guarantee |
Specifications
| CyberPower EC850LCD | CyberPower ST900U | |
|---|---|---|
| Power | ||
| Rated apparent power | 850 VA | 900 VA |
| Rated real power | 510 W | 500 W |
| Topology | - | Standby |
| Battery waveform | - | Simulated sine |
| Automatic voltage regulation | - | No |
| Outlets and features | ||
| Outlets | 12 (6 on battery) | 12 (6 on battery) |
| Format | Desktop | Desktop |
| Display | LCD | LED indicators |
| USB charging ports | - | Yes |
| Data port, software or network option | Yes | Yes |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Connected-equipment guarantee | $100,000 | $125,000 |