This high capacity battery string E3SBTH4 for use with Easy UPS 3S comes with internal battery slots and Easy UPS 3S Empty Modular Battery Cabinet (E3SXR6). Each battery string consists of four 9 Ah battery modules (E3SBTHU). * High-capacity 9 Ah VRLA batteries * Compatible with Easy UPS 3S with internal battery slots * Copmatible with Easy UPS 3S Empty Modular Battery Cabinet * Includes 4 battery modules