Lathem Sonachron DWA-S Battery – Backup Battery Replacement

The Lathem Sonachron battery is designed as the internal backup power source for the DWA-S Sonachron program timer. This battery allows the system to maintain time and retain programmed schedules during power outages, helping prevent lost bell schedules or control events. When the battery weakens, the display may dim or the system may lose settings after power interruptions.

Many Sonachron units remain in service for years, and battery replacement is one of the most common maintenance items. The internal battery automatically recharges while the unit is plugged in, but like all rechargeable batteries, it gradually loses capacity over time. Replacing the battery restores reliable backup operation and helps avoid reprogramming after outages. 

Common Signs Battery Replacement Is Needed

• Clock loses time after power failure
• Stored schedules disappear
• Display appears dim during operation
• Unit has not had battery replacement in several years

Florida Time Clock provides replacement batteries, supplies, and assistance for maintaining older Lathem Sonachron systems, helping businesses extend the life of existing equipment.

FAQ

Is this battery difficult to replace?

Most replacements are straightforward and can be completed by accessing the side panel while the unit remains powered.

Can a dead battery cause programming loss?

Yes. The battery maintains memory during power loss, so failure can result in lost schedules.

Should the unit be replaced instead?

Many Sonachron systems continue to operate reliably once the battery is replaced, making it a cost-effective repair.

Helpful links: Supplies | Repair Service | Time Clocks

Common Battery Failure Symptoms

Many service callse related to timing problems are trace back to weak backup batteries.

Backup batteries in time clocks and program timers gradually lose capacity over time. When the battery can no longer hold a charge, the equipment may continue to operate while plugged in but fail to retain time or programming during power interruptions. Recognizing these symptoms early helps prevent unexpected resets and lost schedules.

• Clock or timer loses time after power outages
• Stored schedules or programmed events disappear
• Display becomes dim or difficult to read
• Unit resets to default settings
• Programming must be re-entered after unplugging

In many cases, replacing the internal backup battery restores normal operation and extends the life of otherwise reliable equipment. Preventive battery replacement every few years helps avoid downtime and unnecessary service calls.