OMRON BY80S is a 800VA / 500W standby (offline) UPS made for the Japanese market. It is rated for AC100V only, so outside Japan it needs a step-down transformer or a 100V supply. The replacement battery is the BYB80S.Japan-domestic UPS units like the BY80S are often built into Japanese-made machines — semiconductor and SMT lines, inspection systems, machine tools and lab analyzers. Replacing a failed unit with the same model avoids rewiring and re-qualification. We ship genuine new units from Tokyo by FedEx; tell us your country and we will confirm voltage and plug before you order.Quick facts for international buyers Model BY80S Usable on 110–120V mains No — this is a Japan-domestic model rated for AC100V only. Outside Japan, use it behind a step-down transformer that supplies 100V, or inside Japanese equipment that already provides 100V. Input voltage AC100V Input plug / connection NEMA 5-15P Output outlets NEMA 5-15R Replacement battery BYB80S Battery type Sealed lead-acid (VRLA), non-spillable. Expected life: 4–5 years at 20°C. Market Genuine new product for the Japanese market. Manuals and labels are in Japanese. Need help? See the OMRON / Mitsubishi UPS battery cross-reference, or contact us with your UPS model and country and we will confirm compatibility before you order. Manufacturer specifications UPS topology Standby (offline) Form factor Vertical or horizontal placement Rated input voltage AC100V Rated input frequency 50/60Hz±4Hz Number of input phases Single-phase 2-wire (with ground) Input plug NEMA5-15P Rated output voltage AC100V±6% Rated output frequency 50/60Hz±1Hz Number of output phases Single-phase Output outlet type NEMA5-15R Backup outlets 4 Non-backup outlets (surge only) 0 Maximum output capacity (W) 500W Maximum output capacity (VA) 800VA Backup time (at full load) 4 minutes Output voltage during battery operation 100V Output frequency during battery operation 50/60Hz±1Hz Output waveform during battery operation Sine wave Transfer time Within 10msec Battery type Sealed lead-acid (VRLA) Number of batteries 1 Charging time 12 hours Bundled power management software Yes (PowerAct Pro, UPS Service Driver, UPS Power Manager) Software OS support Windows/Linux/Mac Surge function Yes – power-line noise and lightning surge protection Safety standards UL1778 Dimensions 235mm×85mm×315mm Weight 6.4kg Remarks 3-year warranty (with 1-year battery free service)/power factor correction (PFC) built-in power supply/compact/low price/long-life battery (4 to 5 years) (user replaceable) RoHS Directive Correspondence