Siemens 6ES5980-0MB11 Lithium Battery

This lithium battery preserves program and data memory in SIMATIC S5 systems. It provides stable backup power when the main supply turns off. You can replace this unit without losing stored information.

Technical Specifications

Parameter	Details
Brand	Siemens
Model	Siemens 6ES5980-0MB11
Category	Lithium Battery (SIMATIC S5 Series)
Dimensions (Diameter x Height)	14.5 mm x 25.5 mm
Weight	0.01 kg (10 grams)
Battery Chemistry	Lithium / Manganese Dioxide (Li/MnO₂)
Nominal Voltage	3.6 V
Nominal Capacity	950 mAh
Number of Cells	1 cell
Terminal Type	2-pin connector (mates with S5 CPU socket)
Connector Wire Length	120 mm (approx.)
Storage Life	10 years at 20°C
Data Retention Time	Approximately 100 days with fully charged battery
Self-Discharge Rate	< 1% per year at room temperature
Internal Energy Storage	3.42 Wh (watt-hours)
Operating Temperature	-20°C to +70°C
Storage Temperature	-40°C to +85°C
Compliance	UL 1642, IEC 60086-4
Disposal Requirement	Follow local regulations for lithium batteries

Detailed Feature Overview

This battery delivers 3.6 V with a capacity of 950 mAh. It retains your SIMATIC S5 program for about 100 days continuously. The lithium chemistry provides a flat discharge curve for stable voltage output.

You will find a 120 mm cable with a 2-pin connector attached. This connector mates directly with the battery socket on S5 CPUs. The self-discharge rate remains below 1% per year at room temperature.

Consequently, a stored battery retains most of its capacity for 10 years. The unit weighs only 10 grams, which does not affect shipping costs. Always dispose of lithium batteries according to local environmental regulations.

Installation and Compatibility

Siemens 6ES5980-0MB11 fits S5 CPUs like 6ES5944, 6ES5130, and 6ES5105. Locate the battery socket on the front panel or inside the module. Insert the connector with correct polarity (red wire positive).