The power flickers at 4:47 pm and your spreadsheet just closed. Or the storm rolled through and half your desk gear is dead. The BK550EI is the fix that doesn't need an IT call-out or a six-day courier window. Three outlets ride on battery; three give you surge-only protection for the printer and monitor that don't need the full treatment. At 100 W you get 24 minutes and 20 seconds – enough to save, shut down properly, and walk away. The lead-acid battery is user-replaceable (RBC2), so when it sags in year three or four, you swap it yourself in ten minutes. No service call. No "book a slot for next Tuesday." 40 dBA means it hums quieter than your aircon. Tower unit at 16.5 × 9.1 × 28.4 cm, 6.32 kg. Sits on a desk, under a monitor, or in the corner of a server closet. Not rack-mountable
| brand | APC |
| model | BK550EI |
| series | Back-UPS |
| rated_power_va | 500 VA |
| rated_power_w | 300 W |
| ups_type | Standby |
| wave_type | Stepped approximation to a sinewave |
| input_voltage | 230 V |
| output_voltage | 230 V |
| input_connection | IEC 60320 C14 |
| output_connections | 3× IEC 60320 C13, 1× IEC 60320 C13 surge, 2× IEC jumpers surge |
| total_outlets | 6 |
| battery_type | Lead-acid (user-replaceable) |
| replacement_battery | RBC2 |
| transfer_time_typical_ms | 6 |
| transfer_time_max_ms | 10 |
| runtime_100w | 24 min 20 sec |
| dimensions_cm | 16.5 × 9.1 × 28.4 |
| weight_kg | 6.32 |
| acoustic_level_dba | 40 |
| mounting | Tower (not rack-mountable) |
| data_line_protection | RJ45 analog phone / fax / DSL |
| operating_temp_c | 0–40 |
| storage_temp_c | -15–45 |
| network_frequency_hz | 50/60 ± 3 (auto-sensing) |
| category | Electronics & Components > Power & Batteries |
