Tadiran TL-5902 1/2 AA 3.6V Primary Lithium Battery

The Tadiran TL-5902 1/2AA 3.6V is a compact, high-reliability primary lithium thionyl chloride cell built for industrial applications. With a 1.2Ah capacity and stable 3.6V output, it’s ideal for PLC backup, utility metering, memory/RTC backup, and remote sensors where long shelf life and predictable discharge are critical. The button-top termination simplifies installation and ensures consistent contact. At just 9.2 g and small 1/2AA dimensions, the TL-5902 fits tightly into compact electronics without adding bulk. Note: this is a non-rechargeable cell and is restricted to ground shipping only — follow local disposal and transport rules.

Overview: This guide helps you install, maintain, and safely replace the Tadiran TL-5902 1/2AA 3.6V battery in industrial devices such as PLCs, meters, and remote sensors. Follow all device manufacturer and local regulations.

Step 1 — Verify Compatibility
Confirm your device requires a 3.6V 1/2AA Li-SOCl₂ primary cell and supports the TL-5902 form factor and button-top termination. Check maximum allowable continuous and pulse currents against the TL-5902’s recommended discharge (~500 µA typical).

Step 2 — Power Down & Prepare
Power down the equipment and follow lockout/tagout if applicable. Ground yourself to avoid static discharge when handling PCBs. Gather appropriate gloves and tools.

Step 3 — Access Battery Holder
Open the device’s battery compartment or PCB holder carefully. Note battery orientation/polarity markings. If replacing an old cell, observe how it was seated and any insulating washers or spacers.

Step 4 — Remove Old Battery Safely
Gently remove the old battery using non-metallic tools where possible. Avoid twisting or bending the terminal. If the old cell shows leakage, corrosion, or swelling, wear gloves and clean the compartment with isopropyl alcohol after removing residue.

Step 5 — Install TL-5902
Insert the new Tadiran TL-5902 with correct polarity: button top = positive (confirm with device markings). Ensure firm contact with terminals and that the cell sits flush; do not force. Secure any holder clips or covers.

Step 6 — Power Up & Test
Restore power and confirm device function. Check that memory, RTC, or backup systems operate normally. For devices with voltage monitoring, verify the battery voltage is near nominal 3.6V.

Step 7 — Record & Dispose
Log installation date for future maintenance. Recycle the removed battery at a certified collection point—do not discard in household waste. Note: follow local hazardous material and transport rules when storing or shipping used cells.

Troubleshooting:

• Device won’t power on: Re-check polarity and seating. Inspect holder for corrosion.

• Low runtime or unexpected reset: Ensure correct battery model and check device current draw—excessive drain reduces life.

• Terminal corrosion: Clean contacts and ensure device sealing is intact to prevent moisture ingress.

Safety Notes:
Never attempt to recharge primary TL-5902 cells. Avoid short circuits and exposure to extreme heat. For shipment, use ground-only carriers as required by regulation.

Q1. What is the capacity of the Tadiran TL-5902 battery?
The Tadiran TL-5902 typically provides 1.2 Ah of capacity at nominal conditions. That capacity is optimized for low continuous loads (microamp to milliamp range) and is ideal for devices like PLC memory backup, meters, and remote sensors where consistent, long-term energy is required. Actual runtime depends on load profile, temperature, and device power draw—consult device specifications to estimate expected service life.

Q2. Is the Tadiran TL-5902 rechargeable?
No. The TL-5902 is a primary lithium thionyl chloride (Li-SOCl₂) cell and is not rechargeable. Attempting to recharge will damage the cell, risk leakage, or create a safety hazard. When the battery reaches end-of-life, replace it with a new TL-5902 (or exact equivalent) and dispose of the used cell following local hazardous-waste and recycling rules.

Q3. What devices commonly use the TL-5902?
Common uses include PLC backup memory, utility meters, remote telemetry units, alarm and security systems, IoT sensors, and other industrial instruments requiring long-term standby power. Its compact 1/2AA size and 1.2Ah capacity make it suitable where space is limited but long life is essential.

Q4. What are the physical dimensions and weight of the TL-5902?
The TL-5902 measures approximately 0.57" diameter × 0.99" height (14.5mm × 25.2mm) and weighs about 9.2 g. It uses a button-top extending termination style for reliable contact in holders and PCB mounts.

Q5. How should I store and handle TL-5902 batteries?
Store unused TL-5902 cells in a cool, dry place away from direct sunlight and high humidity—ideally below 30°C. Keep them in original packaging until use, avoid short-circuiting the terminals, and do not expose to fire or high heat. For safe handling, use insulated tools and avoid mixing old and new cells in a single device.

Q6. Are there shipping restrictions for Tadiran TL-5902 batteries?
Yes. Due to lithium content and transport regulations, the TL-5902 typically requires ground-only shipment. Air transport restrictions may apply depending on carrier and region. Always confirm shipping methods with suppliers and ensure proper packaging and declaration for hazardous materials.