Is your APC Back-UPS CS350 beeping or not holding a charge anymore?

Time for a fresh battery!

This AJC replacement is an exact fit for the CS350 model, offering reliable power when you need it most.

It's a 12V 8Ah sealed lead-acid (SLA) AGM battery, which means it's maintenance-free, leak-proof, and safe to use indoors.

The F2 terminals match the original, so installation is a simple swap—no modifications needed.

AJC batteries are known for quality: they use high-purity lead (99.998%), absorbed glass mat technology for better performance, and are factory-activated and fully charged, arriving ready to install.

Perfect for keeping your computer, modem, router, or other critical devices running during short power outages.

It's built to last with a durable case and solid construction.

Just pop it into your UPS, reconnect the terminals (always observing polarity!), and let it charge.

For best battery life, avoid completely draining it, recharge after each use, and store it in a cool, dry place when not in use.

A cost-effective way to revive your UPS without buying a whole new unit.

Keep your home office or network setup protected from unexpected power blips.

Reliable, affordable, and from a trusted brand with millions of batteries sold worldwide.