Replacement Battery Cartridges (RBCs) are user replaceable and hot swappable. Each RBC is a complete set of tested and charged batteries for your APC UPS. With the purchase of each RBC you will also get Free Freight back to APC for the disposal of your used batteries in the US.MODEL: RBC4 VENDOR: AMERICAN POWER CONVERSION FEATURES: Replacement Battery Cartridge Black color for use with BK650 BP650 SUVS650 APC provides a FREE freight return tag with each RBC for the disposal of your used batteries. To take advantage of free return freight and proper disposal please be sure to purchase only Genuine APC Replacement Battery Cartridges (RBC). BATTERY- Type: Maintenance-free sealed Lead-Acid battery with suspended electrolyte leakproof Capacity: 0 Volt-Amp-Hour Expected Life: 3 - 5 years SIZE - 3.7''w x 3.90''h x 5.90''d WT.- 8.1 lbs. MANUFACTURER WARRANTY:1 YEAR