Introduction: Pyronix CR34615D Lithium D‑cell Battery — long‑life power for security devices
The Pyronix Lithium D‑cell Battery CR34615D (BATT‑CR34615D) is a purpose‑built 3.0 V primary lithium (Li‑MnO2) cell designed as a direct replacement for the Pyronix Enforcer Deltabell‑WE MKI siren and similar wireless alarm devices. Marketed as the Pyronix CR34615D D‑cell 3V 11Ah, this battery combines a D‑cell form factor with tab/terminal options for easy fitment inside bell boxes and siren enclosures. With nominal voltage of 3.0 V and a capacity of approximately 11–12 Ah, the CR34615D targets long in‑device life, low self‑discharge and reliable high‑current pulse performance required by security sirens.
Key features at a glance
- Nominal voltage:3.0 V
- Capacity:≈11–12 Ah (11,000–12,000 mAh)
- Chemistry:Lithium manganese dioxide (Li‑MnO2), primary (non‑rechargeable)
- High pulse capability:Designed to deliver the current demands of sirens and bell boxes (pulse currents up to ~3000 mA)
- Form factor:D‑cell with tab/terminal options for easy replacement in Pyronix Deltabell MKI enclosures
- Long shelf & in‑device life:Low self‑discharge for long shelf life and up to ~2 years in typical alarm use (device dependent)
Detailed specifications and benefits
- Nominal voltage:3.0 V — stable voltage suitable for Pyronix Enforcer electronics.
- Capacity:Approximately 11–12 Ah (11,000–12,000 mAh), giving extended run times compared with common small cells.
- Chemistry:Li‑MnO2 primary cell — offers high energy density, low self‑discharge and good performance at a range of temperatures.
- Current ratings:Max continuous current ≈2000 mA and max pulse current ≈3000 mA — supports the bursts of current required by sirens and audible devices.
- Form factor:Standard D‑cell diameter and height (Ø ≈34.0–34.2 mm × height ≈61.5 mm) with tab/terminal options to suit Pyronix Enforcer Deltabell‑WE MKI installations.
- Weight:≈125 g — light enough for handheld handling yet robust for enclosures.
- Primary (non‑rechargeable):Intended for replacement, not for recharging. Follow local disposal regulations.
- Long in‑system life:Pyronix indicates up to ~2 years in typical Deltabell MKI duty cycles — this reduces maintenance visits and battery replacement frequency.
- Reliable pulse delivery:High pulse current capability ensures the siren can achieve reliable volume peaks without excessive voltage sag.
- Low self‑discharge:Stored devices retain their charge longer than alkaline equivalents, making this battery ideal for spare stock and rare‑use devices.
- OEM compatibility:Designed as an OEM replacement (Yuasa / PYR referencing), so mechanical fit and terminal layout are matched to the Pyronix enclosure.
Use cases and scenarios where the CR34615D excels
The CR34615D is tailored to environments and devices where dependable, long‑lasting primary power is essential. Typical applications include:
- Wireless alarm sirens and bell boxes:The most common use — the CR34615D supplies the bursts of energy needed for audible alerts while offering long service intervals.
- Outdoor security devices:When installed in protected bell boxes, the battery’s chemistry helps it cope with seasonal temperature swings and long standby periods.
- Remote sensors with occasional high draws:Devices that mostly idle but occasionally need to drive actuators or radios benefit from the battery’s pulse performance.
- Installers and service engineers:For professionals maintaining Pyronix Enforcer systems, using an OEM‑matched battery simplifies replacement and reduces fault troubleshooting.
Comparisons with similar products on the market
When choosing a D‑cell for security devices, it helps to understand how the CR34615D compares with other common options:
- Energy density and shelf life:Li‑MnO2 cells retain much more capacity over time and in storage than alkaline cells. Alkaline self‑discharge and voltage drop under load reduce their suitability for long‑term standby applications.
- Pulse performance:The CR34615D handles high pulse currents better with less voltage sag. Alkalines can temporarily collapse under high loads, which can affect siren performance.
- Temperature resilience:Primary lithium generally outperforms alkalines at lower temperatures, maintaining usable capacity where alkalines fall off.
- Rechargeability:NiMH cells are rechargeable, which can be attractive for frequently cycled devices. However, for many alarm applications that require a sealed, low‑maintenance primary cell with long shelf life, a non‑rechargeable lithium is preferred.
- Self‑discharge:NiMH suffers from higher self‑discharge than Li‑MnO2, meaning stored spares can be unreliable after months of storage unless maintained.
- Application fit:Rechargeables require a charging circuit; many sirens and bell boxes lack that feature. Using a primary Li cell avoids the need to modify the host device.
- Chemistry trade‑offs:Lithium‑thionyl chloride (Li‑SOCl2) cells (ER‑type) offer very high energy density and excellent shelf life but have different voltage profiles and are typically specified for different classes of devices. Li‑MnO2 (CR‑type) provides a good balance of stable nominal voltage (≈3.0 V) and pulse capability suited to sirens.
- Compatibility:Choose the chemistry recommended by your device manufacturer — Pyronix specifies the CR34615D (Li‑MnO2) for the Deltabell‑WE MKI to ensure correct behavior and longevity.
Customer feedback and installer impressions
While individual experiences vary by device and installation, typical feedback collected from installers and security professionals about Li‑MnO2 D‑cells like the CR34615D tends to highlight the following themes:
- Longer service intervals:Installers report fewer return visits for battery replacements when switching from alkalines to the CR34615D, often matching the manufacturer’s ‘‘up to ~2 years’’ estimate in normal duty cycles.
- Reliable alarm performance:Customers note consistent siren output and fewer reported voltage‑related faults, even when sirens are required to sound for longer durations.
- Ease of replacement:The tab/terminal options and OEM form factor reduce installation time and the risk of incorrect connections.
If you are an installer or end user evaluating feedback, consider system duty cycle, local temperatures, and device firmware/behavior to match expectations to real world life. Always follow Pyronix guidance for approved parts.
Compliance, safety and installation notes
This is a primary (non‑rechargeable) lithium cell. Replace only with like‑for‑like battery type and check terminal orientation when fitting. Dispose of used lithium primary batteries according to local regulations — do not incinerate. For full mechanical dimensions, operating temperature range and current ratings consult the manufacturer datasheet: https://docs.rs-online.com/9d08/A700000009966821.pdf
Conclusion: why choose the Pyronix CR34615D?
The Pyronix CR34615D (BATT‑CR34615D) is a specialist security battery that answers the needs of wireless sirens, bell boxes and other alarm devices where long standby life, strong pulse performance and predictable replacement intervals matter. With a nominal 3.0 V Li‑MnO2 chemistry, around 11–12 Ah capacity, tabbed D‑cell form factor and OEM compatibility for Pyronix Enforcer Deltabell‑WE MKI, it reduces maintenance overhead and improves field reliability versus standard alkaline cells.
For installers and site managers seeking a drop‑in replacement that aligns with Pyronix guidance, the CR34615D represents good value: its suggested price point reflects the specialised chemistry and build quality needed for security applications, and the extended in‑service life can offset higher upfront cost through fewer site visits. As always, confirm device compatibility and disposal requirements before fitting, and consult the datasheet for technical detail.
Product at a glance:Pyronix Lithium D‑cell Battery CR34615D, 3.0 V, ≈11–12 Ah — designed for Pyronix Deltabell‑WE MKI sirens, offering long life, reliable pulse performance and OEM form‑factor convenience.
