Saft LM-17500 — 3.0 V Li‑MnO2 Primary A-Size Cell

The Saft LM-17500 is a lithium‑manganese dioxide (Li‑MnO₂) primary cell designed for professional equipment that needs dependable, long‑duration power and a stable 3.0 V output. Choose it for security sensors, portable instruments, data loggers, and backup supplies that operate in varied or harsh environments.

At a Glance

Chemistry	Lithium‑Manganese Dioxide (Li‑MnO2)
Nominal Voltage	3.0 V (primary, non‑rechargeable)
Form Factor	17500 (A‑size) cylindrical — approx. 17 mm diameter × 50 mm length
Performance Traits	Stable discharge voltage, low self‑discharge, good pulse capability with buffering
Typical Operating Temp	Wide range for Li‑MnO2 cells (often sub‑zero to high ambient). Check the current Saft datasheet for exact limits.

When to Use

• Need a long‑life, maintenance‑free primary cell with years of shelf readiness.
• Device requires a stable 3.0 V source and moderate pulse currents (e.g., RF bursts, relays).
• Equipment is exposed to vibration or temperature variation and needs rugged construction.

When to Avoid

• You need rechargeability or frequent cycle use — consider Li‑ion (e.g., 18650) instead.
• Your device expects 1.5 V A‑size alkaline — 3.0 V LM‑17500 is not a drop‑in replacement.
• Very high continuous drain or high pulse spikes without space for a buffer capacitor.

Common Applications

• Security and alarm sensors, access control, and wireless transmitters
• Portable test and measurement instruments, metering, and data logging
• Industrial control modules and memory backup
• Field equipment used intermittently with standby periods

Design and Integration Tips

• Pulse loads: Add a local buffer (e.g., 100–1000 µF electrolytic or a small supercap) close to the load to support burst currents and protect against voltage dip.
• Impedance: Internal resistance rises at low temperatures and with age. Validate worst‑case voltage under load at end‑of‑life.
• Protection: Implement reverse‑polarity protection and short‑circuit safeguards. Do not recharge this cell.
• Mechanical: Use secure holders or clips rated for 17 × 50 mm cells in high‑vibration environments.
• Packs: Do not mix new and used cells or different brands/lots. For series strings, ensure your design tolerates cell imbalance and includes appropriate fusing.

Runtime Planning

Estimate runtime by dividing usable capacity by average load current. Example only (verify the exact capacity from Saft's datasheet for your operating conditions):

• If usable capacity is 2.6 Ah and your average load is 10 mA (0.01 A), estimated runtime ≈ 2.6 Ah / 0.01 A = ~260 hours.
• For pulsed loads, calculate average current and confirm that pulse current and voltage droop stay within device limits.

Storage and Handling

• Store in a cool, dry place in original packaging; avoid shorting the terminals.
• Low self‑discharge helps preserve capacity over long storage intervals; periodically check device battery status if installed.
• Follow local regulations for transport and disposal of primary lithium cells.

Alternatives to Consider

• Li‑SOCl₂ (3.6 V) cells for ultra‑long life at low drain (ensure device tolerates 3.6 V).
• CR123A (16340) Li‑MnO₂ primary where a smaller form factor is acceptable.
• Rechargeable Li‑ion (e.g., 18650) if the application requires frequent cycling.

FAQ

Can I recharge the LM‑17500?

No. It is a primary (non‑rechargeable) lithium cell. Recharging may cause leakage, venting, or fire.

Is it compatible with devices that use A‑size alkaline batteries?

Only if the device is designed for a 3.0 V primary lithium cell. Many A‑size devices expect 1.5 V alkaline; substituting a 3.0 V lithium cell can damage equipment.

How does it perform in cold temperatures?

Li‑MnO₂ cells generally operate well below 0 °C, but internal resistance rises and available pulse current drops. Validate in your worst‑case conditions and add a buffer capacitor.

What terminals are available?

Availability can include flat/button tops or solder/tabbed variants depending on supplier. Verify the termination style that matches your holder or assembly process.

How should I dispose of used cells?

Recycle through approved battery collection programs. Do not incinerate or throw in household trash.