what is the tab size F1 or F2 on the APC 18 #18 battery cartridge ?

They have F2 tabs on them for connection.

Will this fit the APC model SC450?

Yes, RBC18 is the correct battery for the SC450. You can confirm for yourself by going to APC's web site apc dot com and selecting Products/Power/UPS Replacement Batteries, then click Help me Choose and enter the model #.

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APC RBC18 Replacement Battery Cartridge #18

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Option: RBC18

RBC4
RBC18
RBC59

Expected Battery Life (years): 3 - 5
RBC Quantity: 1
Maintenance-free sealed Lead-Acid battery
Stand alone battery stack

Overview

Specs

Reviews (5)

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APC Replacement Battery Cartridge #18 *** Upgrade to a new UPS with APC TradeUPS and receive discount, don't take the risk with a battery failure ***

Model
Brand	APC
Model	RBC18

Details
Type	Battery
Specifications	Battery Type: Maintenance-free sealed Lead-Acid battery with suspended electrolyte : leakproof Battery mounting: Stand alone battery stack Expected Battery Life (years): 3 - 5 RBC Quantity: 1 Operating Environment: 32 - 104 °F (0 - 40 °C) Operating Relative Humidity: 0 - 95% Operating Elevation: 0-10000 feet (0-3000 meters) Storage Temperature: 5 - 113 °F (-15 - 45 °C) Storage Relative Humidity: 0 - 95% Storage Elevation: 0-50000 feet (0-15000 meters)

Dimensions & Weight
Dimensions	1.40" x 11.90" x 4.00" (H x W x D)
Weight	5.70 lbs.

Package Contents
Package Contents	All required connectors, Battery recycling guide, Installation guide, Reusable packaging

Additional Information
First Listed on Newegg	September 25, 2025

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Return for replacement within: 30 days
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Item#: 9SIC2YSKKT2634

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