Additional battery module for extended runtime, Compatible with AEG PROTECT D 1000 LCD+ and AEG PROTECT D 1500 LCD+ UPS systems, A maximum of 6 external battery packs can be connected to the UPS. Additional runtime with 1 battery pack: at 1500 W: + approx. 14 min. at 1000 W: + approx. 22 min. at 750 W: + approx. 30 min. Height: 2 U Net weight: 24.6 kg