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$81.37 
B3E RBC18-B3E Compatible Replacement Battery Cartridge for APC UPS systems, designed as a direct replacement for APC Replacement Battery Cartridge #18.
Compatible with APC models including PS250, PS250I, PS450, PS450I, SC250RM1U, SC250RMI1U, SC450R1X542, SC450RM1U, and SC450RMI1U.
The RBC18-B3E uses high-quality sealed lead-acid battery technology and is engineered to meet or exceed OEM specifications for dependable UPS backup power. Backed by a 2-year warranty, it provides a reliable and cost-effective alternative to the OEM battery cartridge.