American Power Conversion (APC) #18 Replacement Battery Cartridge

About American Power Conversion (APC) #18 Battery Cartridge FEATURED REVIEWS See all 2 reviews   It fits – so I guess it is the right one! By Angel A. Works perfectly as far as I can tell. A battery backup is just that – for backup. I assume the main question is – does it fit? And yes, it does fit.   Easy to Install By Mclarfield The replacement battery was easy to install and did not require me to remove the unit from the rack mount. No more beeping in the middle of the night! The APC RBC18 replacement battery is specifically designed for high rate UPS discharge applications, where high power output is required over short periods of time.