The APC Replacement Battery Cartridge #159 is an original replacement battery for selected compatible APC Smart-UPS systems. It is designed to restore the battery performance and backup time of a compatible UPS after the end of the battery's service life.

The fully assembled battery cartridge uses maintenance-free, sealed lead-acid batteries. In compatible UPS models, it can be replaced using hot-swap, without having to shut down connected devices. The delivery includes the required connectors, battery recycling instructions, and a battery insert or battery enclosure.

The cartridge is designed for APC Smart-UPS models SMT1500RM2UC and SMT1500RMI2UC, among others. The typical battery service life is three to five years and depends on use, load, and environmental conditions. Compatibility must be checked before purchase based on the exact UPS model number.