CSB Battery HR1234W 12V 9Ah AGM battery F2 Pair

High-rate UPS battery pair

This pair of CSB HR1234W batteries delivers 12 volts and 9 amp-hours each in a sealed lead-acid AGM format. They are built for equipment that demands short, high-rate power bursts such as uninterruptible power supply units. The F2 Fast-on tabs allow quick, tool-free connection in compatible bays. Buyers needing deep-cycle endurance or higher capacity should look elsewhere.

34 watts per cell output

The defining specification is the high-rate density of 34 watts per cell, which yields up to 204 watts for 15 minutes down to 1.67 volts per cell at 77 degrees Fahrenheit. This figure confirms the pack can sustain the intense discharge profile required by many UPS designs. If your application calls for a lower continuous load or a different voltage curve, this model may not match.

Sealed AGM thermal profile

As sealed AGM units, the batteries operate without free electrolyte, so normal use produces minimal gassing and no liquid spillage risk. Internal resistance stays low during the rated 15-minute high-rate discharge, limiting heat rise and keeping acoustic noise negligible. No active cooling is required in typical UPS enclosures.