In today’s POTS replacement and life-safety communication market, battery performance has become a critical differentiator. But while many products require large battery packs or bulky external power modules, the PR12 achieves something unique: TRUE 24-hour standby using only a single 18650 battery. This capability not only reduces cost and footprint—it fundamentally reshapes how emergency communication systems can be deployed.

PR12

The key to this performance is not just the battery itself, but the architecture behind it. The PR12 is designed from the ground up for ultra-low-power operation. When external DC power is lost, the device automatically enters a dedicated standby mode, disabling the WAN and LAN interfaces while keeping the core telephony engine active. This reduces power consumption dramatically without compromising the system’s ability to detect or respond to incoming communication events.

When powered by battery, During the standby status, PR12 periodically wakes up to maintain network supervision and it also maintains heartbeat interval with VolaCloud , ensuring remote visibility and connectivity even during extended outages. More importantly, both SIP and VoLTE calls (Inbound and outbound) can instantly wake the device, guaranteeing that emergency calls and signalling from alarm panels are never missed.

VolaCloud

Real-world testing demonstrates standby times as long as 26 hours, This means that installers and system integrators can deploy PR12 confidently in environments where power loss is unpredictable—elevators, utility substations, industrial sites, and remote buildings.

Note: Real standby time is depending on the type of analog phone connected. Panels with LCD displays consume more power, while simpler analog sets allow for even longer standby.

One of the advantages of using an 18650 battery is serviceability. The cell is field-replaceable, allowing technicians to swap it on-site without opening sealed housings or handling proprietary battery packs. This reduces downtime, lowers maintenance cost, and enables organizations to maintain predictable, standardized standby performance across all locations.

TRUE 24-hour standby is more than a spec—it is a reliability promise. It ensures that life-safety systems continue operating through prolonged outages, giving building operators and emergency teams confidence that critical communication pathways will remain open.

The PR12 proves that when engineering focuses on power efficiency rather than brute-force energy storage, even a single battery can deliver exceptional resilience.