Honeywell TC-BATT01 | 3.6V PLC Battery

Product Overview

This primary lithium battery preserves user programs and retains retentive variables during power-off intervals. Programmable logic controllers rely on this energy source to maintain critical process parameters. The TC-BATT01 plugs directly into the designated battery socket on Honeywell PLC CPU boards. Its proven thionyl chloride chemistry delivers consistent performance across extreme temperature ranges. Control engineers can exchange this unit while the processor remains operational. The battery’s polarized connector eliminates any possibility of incorrect installation.

Technical Specifications

Parameter	Specification
Battery Chemistry	Lithium thionyl chloride (Li-SOCl₂)
Nominal Voltage	3.6 VDC
Rated Capacity	2200 mAh
Continuous Discharge Current	120 mA maximum
Pulse Discharge Current	350 mA (for 1 second)
Operating Temperature	–40°C to +85°C
Recommended Storage Temperature	10°C to 30°C
Storage Life (uninstalled)	8 years minimum at 25°C
Expected Service Life	5 years in typical PLC applications
Replacement Interval	4–5 years (based on usage)
Connector Type	2-pin locking header with polarization
Wire Length	160 mm ±10 mm
Cell Dimensions	32 mm diameter x 60 mm height
Assembly Weight	0.10 kg
Safety Compliance	UL 1642, IEC 60086-4, UN 38.3

Energy Storage and Discharge Behavior

The TC-BATT01 stores 7.92 watt-hours of total energy at nominal voltage. Its flat discharge curve maintains stable output until the final stages of depletion. Internal impedance remains below 4 ohms throughout the cell’s useful lifetime. The battery delivers reliable starting current for processor memory initialization routines. Low self-discharge ensures the unit retains charge even after years in storage.

Physical Design and Connection

A durable heat-shrink sleeve encases the cell to protect against moisture and abrasion. Stranded tinned-copper leads terminate in a keyed 2-pin header connector. The locking mechanism secures the connection against vibration and thermal cycling. Weighing only 100 grams, this battery imposes negligible mechanical load on PCB sockets. Its 160-millimeter flexible lead supports varied mounting positions within enclosures.

Safety Systems and Protection Features

Engineers incorporated a pressure-relief vent to prevent catastrophic failure under abuse conditions. The non-flammable electrolyte significantly reduces fire risk compared to standard batteries. Series-mounted Schottky diodes in the PLC prevent any charging current from reaching the cell. Dual-layer lead insulation resists cuts and abrasion during cabinet maintenance activities. This battery carries full UN 38.3 certification for safe air transportation.

Voltage Monitoring and Replacement Alerts

The host PLC performs automatic voltage checks at system power-up and at regular intervals. A configurable alarm threshold notifies operators when voltage falls below 3.0 VDC. The controller stores the battery installation date in its non-volatile memory. Visual indicators on the CPU faceplate show battery health status through a dedicated LED. Users can query remaining capacity estimates through the programming software interface.