Upgrade your power backup with the APC Replacement Battery Cartridge 159. This lead-acid battery is designed to be maintenance-free, sealed, and leak-proof, ensuring reliable performance without the hassle. Its hot-swappable feature allows for easy replacement without shutting down your equipment, making it perfect for critical systems. With a minimum lifespan of 3 years, this durable battery is an essential component for uninterrupted power supply. The sleek black design fits seamlessly into your existing APC units, providing peace of mind and dependable energy when you need it most.