Amazon.com: APC BR900GI UPS Uninterrupted Power Supply : Electronics
Battery kit for APC Smart UPS 750 & APC Back UPS Pro 900 replaces APCRBC123
Computer Plus - APC Power-Saving Back-UPS Pro 900,230V (BR900GI) Output Output Power Capacity|540 Watts / 900 VA Nominal Output Voltage|230V Efficiency at Full Load|81% Output Frequency (sync to mains)|50/60 Hz +/- 3