UPS and Standby

Swapping UPS and alarm batteries

Copy the code printed on the existing battery, then confirm voltage, amp-hours, size and post style. Spade terminals come in different widths, so look closely. In a UPS, every battery in a string should be renewed together with identical units.

What shortens standby life

• Heat: the main enemy, so a cool, ventilated room makes a real difference.
• Float voltage: the charging circuit must be set correctly for the battery.
• Calendar age: capacity fades gradually even when the battery is rarely called upon.

Quick answers

How will I know they are worn?

Many UPS units run self-tests and raise a warning when capacity drops. For alarm panels and exit lights, note the date of installation on the case.

Is mixing makes in one UPS acceptable?

Better not. Identical batteries share the load evenly, whereas a mixed string lets the weakest block decide how long the UPS can hold out. Standby specialists include Long, Ritar, Cyclon and Genesis.