Saft LM-33600 Li‑MnO2 D‑Cell Battery (Primary, 3.0 V)

The Saft LM-33600 is a non-rechargeable, D-size lithium‑manganese dioxide cell engineered for long runtimes, stable voltage, and dependable operation in demanding field conditions. It is well-suited for remote monitoring, industrial control backup, and devices that draw low to moderate current with occasional pulses (e.g., radio transmissions).

At a Glance

• Chemistry: Lithium–Manganese Dioxide (Li‑MnO2), primary (non‑rechargeable)
• Nominal voltage: 3.0 V (flat discharge profile for sensitive electronics)
• Form factor: D cell, approx. 33 × 61 mm
• Use case: Long-life, low/medium drain with moderate pulse needs
• Readiness: Low self‑discharge for multi‑year storage and intermittent duty

When to Choose the LM‑33600

• Use if your device needs multi‑year operation on a single cell, stable 3.0 V output, and reliable performance across cold/heat.
• Use if your load is mostly low current with occasional transmission or wake‑up pulses (add a capacitor to buffer peaks).
• Avoid if you need a rechargeable solution—consider Li‑ion packs instead.
• Avoid as a direct drop‑in for 1.5 V alkaline D cells—voltage is 3.0 V and not compatible with most consumer devices.

Typical Applications

• Remote sensors and data loggers (environmental, utility metering, oil & gas)
• Industrial controls and PLC memory backup
• Security, alarms, and safety devices
• Asset tracking, beacons, and navigation aids

Key Considerations

Electrical

• Plan for both average and peak current. Use a low‑ESR capacitor to support radio or motor start pulses.
• Set a conservative cutoff voltage per cell (many designs use ~2.0–2.2 V) to avoid deep depletion; verify with the Saft datasheet.
• For series stacks, use matched cells from the same lot and include cell‑level fusing or PTCs where appropriate.

Mechanical

• Use robust holders or brackets to prevent vibration‑induced contact loss.
• Maintain firm, clean contacts; avoid point loads that could deform the can.

Environmental

• Li‑MnO2 D cells typically operate across wide temperatures (often sub‑zero to high heat). Confirm exact limits in the Saft datasheet for your environment.
• Seal against moisture and dust; prevent condensation across contacts.

Runtime Planning

Estimate runtime using your device’s duty cycle. Example (planning only):

1. Assume a nominal capacity in the 15–18 Ah range typical of Li‑MnO2 D cells (verify actual capacity in the datasheet).
2. Compute average current, including sleep, active, and pulse intervals (account for capacitor recharge after pulses).
3. Runtime (hours) ≈ Capacity (Ah) ÷ Average current (A). Add a 20–30% margin for temperature, aging, and variability.

Tip: Validate in a temperature chamber at expected extremes to confirm the estimate before large deployments.

Alternatives and Trade‑offs

• Li‑SOCl2 D cells: Often higher capacity for ultra‑low‑drain, long‑life use, but typically require a capacitor for pulses and may have different temperature behavior.
• Rechargeable Li‑ion: Choose if you can recharge or need frequent high‑power pulses; expect more maintenance and BMS needs.

Storage and Handling

• Store cool and dry in original packaging; rotate stock FIFO.
• Do not short, crush, or heat. Never attempt to recharge a primary lithium cell.
• Follow applicable transport and disposal rules for lithium metal batteries (e.g., UN 3090/3091). Consult local regulations.

Quick Specs (Guide)

Chemistry	Lithium–Manganese Dioxide (Li‑MnO2), primary
Nominal Voltage	3.0 V
Size	D (approx. 33 mm dia × 61 mm length)
Capacity	See datasheet; D‑size Li‑MnO2 is commonly 15–18 Ah at low drain
Pulse Support	Moderate; use a capacitor for higher peaks
Operating Temperature	Wide range; verify exact limits in the Saft datasheet

FAQ

Is the LM‑33600 rechargeable?

No. It is a primary lithium metal cell. Do not charge.

Can I replace an alkaline D cell with the LM‑33600?

Not directly. Alkaline D cells are 1.5 V; the LM‑33600 is 3.0 V. Only use it in equipment designed for 3.0 V cells.

Can I use cells in series or parallel?

Yes, but use new, matched cells from the same lot, include appropriate protection (fuses/PTCs/diodes), and follow the device manufacturer’s guidelines.

How do I handle pulse loads for radios or solenoids?

Add a low‑ESR capacitor across the load or rails. Size it so the cell’s instantaneous current stays within its pulse rating and voltage droop remains acceptable.

What affects real‑world runtime most?

Average current, temperature extremes, pulse magnitude/duty cycle, and cutoff voltage settings have the largest impact. Validate under realistic conditions.