The APC RBC123 UPS Battery Cartridge is a high-quality replacement battery designed for APC uninterruptible power supply (UPS) systems. This cartridge includes two 12V batteries that provide a total voltage compatibility of 24V, ensuring reliable power backup for critical systems. The proprietary APC plug and 2-pin connector make it easy to install and compatible with specific APC models. The black color and compact design make it a seamless addition to any UPS setup. With a California Prop 65 warning, you can trust in the safety and reliability of this replacement battery cartridge. It looks like someone may have attempted to check the charge themselves as one of the terminals has some black marks. Please see pictures. I did take it to one of the local battery outfitters and had them check it. It was charged and holding.