Procell Constant 9V (PC1604)

Duracell Procell Constant 9V (PC1604)

The Procell Constant 9V (PC1604) is a professional alkaline battery engineered for predictable, steady power in low- to mid-drain devices. It is a dependable choice for smoke and CO alarms, multimeters, wireless microphones, and remote controls used in facilities, hospitality, education, and public safety.

At a glance

• Chemistry: Alkaline (Zn/MnO2)
• Size/format: 9V (6LR61, 1604, PP3)
• Nominal voltage: 9 V
• Typical capacity: ~620–700 mAh (varies by load and cutoff)
• Operating temperature: −4°F to 129°F (−20°C to 54°C)
• Shelf life: up to 7 years when stored properly
• Designed for professional use with date-coded packaging

When to choose PC1604

• Use for steady, moderate loads: smoke/CO alarms, test instruments, wireless mics used for events, remote controls, and security accessories.
• Choose if you need predictable voltage, long shelf stability, and cost-effective bulk deployment.

Consider alternatives if

• Your device has frequent high pulse loads or high-drain bursts (e.g., certain wireless transmitters) — consider a high-drain optimized 9V or a lithium 9V.
• You need operation below −4°F or above 129°F — lithium 9V primaries handle wider temperature extremes.
• You prefer rechargeability for daily use — look at NiMH 9V (check device compatibility; many NiMH are 8.4 V nominal).

Expected runtime examples

Actual runtime varies by device design, load, and cutoff voltage. Use these as planning estimates:

Device / use case	Typical runtime	Notes
Smoke alarm (standby, periodic tests)	6–12 months	Replace when low-battery chirp occurs or per the alarm maker’s schedule.
Wireless mic transmitter (event use)	5–8 hours	Runtime depends on RF power and audio settings; keep spares on hand.
Multimeter (intermittent use)	6–12 months	Frequent backlight or continuity beeper use reduces life.
Remote control / access device	12–24 months	Short, infrequent transmissions yield longer life.

Compatibility and size codes

• Form factor: 9V with snap (PP3) connector.
• Common equivalents: 6LR61 (alkaline), 1604A, E-Block, PP3.
• Do not replace with zinc‑carbon (6F22) for professional applications; alkaline provides better life and leakage resistance.
• Rechargeable 9V (NiMH/Li-ion) may be 7.2–8.4 V nominal — verify device requirements before switching chemistries.

Storage, handling, and safety

• Store cool and dry (ideally 59–77°F / 15–25°C). Avoid heat, freezing, or direct sunlight.
• Keep in original packaging until use; rotate inventory by earliest date code (FIFO).
• Do not mix old and new batteries or different brands/chemistries in the same device.
• Remove batteries from devices stored long term to reduce leakage risk.
• Do not recharge, crush, or incinerate. Tape terminals before disposal/recycling per local regulations.

Alternatives

• High-drain 9V needs: consider a 9V optimized for pulse/high drain or a lithium 9V primary for longer life.
• Extreme temperatures or longest standby: lithium 9V primary.
• Frequent daily use with charging program: NiMH 9V rechargeable (ensure device supports lower nominal voltage and use a compatible charger).

FAQ

Is the Procell Constant 9V (PC1604) rechargeable?

No. It is a primary (single-use) alkaline battery. Do not attempt to recharge.

What does “Constant” mean compared to “Intense”?

“Constant” targets devices with steady, moderate drains for predictable, long service life. For frequent high-current pulses, choose a 9V optimized for high drain (often marketed as “Intense” or use lithium).

Will it work in smoke or CO alarms?

Yes, many alarms specify 9V alkaline. Test alarms monthly and replace the battery at the first low-battery chirp or per the alarm manufacturer’s schedule.

Can I mix this with other 9V batteries?

No. Mixing new and used cells or different brands/chemistries can cause leakage or poor performance. Replace all batteries in a device at the same time.

How should I store spares?

Keep them in a cool, dry place in their packaging, away from metal objects. Do not refrigerate or freeze. Use first-in, first-out based on date code.