This APC Easy UPS SRV Battery Pack SRV24BP-9A, connected with compatible SRV On-Line UPS, provides extended runtime during prolonged power outages. This 24V SRV tower battery pack is compatible with 6kVA/1kVA SRV Extended Runtime UPS models. The extended battery pack is a lead-acid battery with a 2-year warranty. * 24V SRV tower battery pack for 6kVA/1kVA SRV On-Line * Connect up to 4 battery packs for extended runtime