APC Battery Cells — for APC RBC21 Pack (NOT a Complete Cartridge)
These are individual AGM (VRLA) batteries — the same cell type used to populate an APC RBC21 battery module. They are not a finished RBC21 cartridge. Use them to rebuild your existing tray/harness if you wish to perform the replacement yourself.
Typical RBC21 modules are assembled from a single 12 V, 21 Watt cell.