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- Battery for Simatic S-7 PLC Logic Controller
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Siemens A5E00331143: Product Overview, Technical Parameters, Applications, Advantages, and Related Models
1. Product Introduction
The Siemens A5E00331143 is an industrial equipment part number associated with the SIMATIC automation product portfolio. To identify its precise function, however, the complete part designation and the equipment it belongs to need to be confirmed. The A5E prefix is used across a range of industrial spare parts and components, so the part number alone is not enough to establish its exact product type, electrical characteristics, or mechanical specifications reliably.
For industrial purchasing and maintenance, it is important to distinguish between a complete automation device and a replacement component. A controller, operator panel, industrial computer, power supply, cooling fan, and internal circuit-board assembly each have different functions and compatibility requirements.
The following overview is organized for technical evaluation and procurement. Specifications that cannot be reliably confirmed for A5E00331143 are marked accordingly rather than filled in with assumed values.
2. Brand and Product Series
| Item | Description |
|---|---|
| Brand | Siemens |
| Product family | SIMATIC industrial computing spare parts |
| Model number | A5E00331143 |
| Product type | Lithium-metal CMOS backup battery |
| Battery format | CR 1/2 AA |
| Battery type designation | LM188 |
| Nominal voltage | 3 V |
| Nominal capacity | Approximately 950 mAh, depending on the specified cell configuration |
| Main function | Backup power for supported memory and clock-retention circuits |
| Compatible equipment | Selected SIMATIC Box PC, Panel PC, Microbox PC, and programming-device models |
| Rechargeable | No |
| Dimensions | Approximately 14.45 mm diameter × 25.3 mm length for the cell; connector and lead dimensions may differ |
| Net weight (kg) | Approximately 0.010–0.012 kg |
The battery is a spare part for industrial computing equipment. Its purpose is to supply a small amount of backup power to supported circuits when the main power supply is switched off.
The exact battery connection and supported host models should be checked before ordering. Some compatible assemblies use wires and a plug, so an ordinary cylindrical cell of the same size may not be a suitable direct replacement.
3. Detailed Technical Parameters
| Parameter | Specification |
|---|---|
| Product model | A5E00331143 |
| Brand | Siemens |
| Product series | SIMATIC PC spare parts |
| Product description | Lithium-metal CMOS backup battery |
| Battery designation | VARTA CR 1/2 AA, LM188 |
| Chemistry | Primary lithium battery; confirm the exact cell chemistry on the installed battery |
| Nominal voltage | 3 V |
| Nominal capacity | Approximately 950 mAh |
| Nominal energy | Approximately 2.85 Wh at 950 mAh and 3 V |
| Cell format | 1/2 AA |
| Rechargeable | No |
| Intended function | Backup power for compatible memory-retention or clock circuits |
| Electrical connection | May be supplied with leads and a connector, depending on the assembly |
| Compatible equipment | Selected Box PC 620/627/827, Box PC 820/840, Panel PC 670/677, Microbox PC 420, IPC427C, and selected programming devices |
| Cell diameter | Approximately 14.45 mm |
| Cell length | Approximately 25.3 mm |
| Overall assembly dimensions | Depends on the lead length, connector, and packaging |
| Dimensions (W × H × D) | Approximately 14.45 × 25.3 × not applicable mm for the bare cylindrical cell; complete assembly dimensions require confirmation |
| Net weight (kg) | Approximately 0.010–0.012 kg |
| Operating temperature | Confirm the exact cell specification; replacement cells may have different temperature limits |
| Storage temperature | Confirm the exact cell specification |
| Maintenance | Replace when required by the equipment’s battery-monitoring or service procedure |
| Disposal | Follow applicable procedures for lithium batteries |
Capacity, dimensions, and weight may vary slightly between original battery assemblies and compatible replacement cells. For procurement, the complete assembly—including connector and lead configuration—is more important than the bare-cell dimensions alone.
3.1 Voltage and capacity
The battery has a nominal voltage of 3 V and a nominal capacity of approximately 950 mAh in the commonly specified replacement configuration.
Voltage is the electrical potential supplied by the cell, while capacity indicates how much electrical charge it can deliver under specified test conditions. Actual service life depends on the current drawn by the backup circuit, the battery’s age, storage conditions, and operating temperature.
A battery with the same nominal voltage but a substantially different capacity may have a different replacement interval. Always follow the host equipment’s requirements rather than selecting a cell based on voltage alone.
3.2 Battery chemistry and format
The CR 1/2 AA format is a compact cylindrical battery format. The LM188 designation identifies the battery type associated with this part number.
The battery is non-rechargeable. It should not be connected to a charging circuit or treated as a rechargeable backup battery.
When replacing the battery, verify its chemistry and electrical characteristics. Different lithium battery chemistries can have different discharge characteristics and temperature limits even when their nominal voltages are similar.
3.3 Connector and wiring
The complete spare-part assembly may include wires and a plug designed for a specific industrial computer.
This is an important compatibility consideration. A bare CR 1/2 AA cell is not automatically interchangeable with a battery assembly that includes a connector, because the host computer may require a particular polarity, plug, cable arrangement, or mounting configuration.
Before ordering, compare the original battery’s connector, wire arrangement, polarity markings, and part number.
3.4 Dimensions and weight
The cylindrical cell measures approximately 14.45 mm in diameter and 25.3 mm in length. The complete assembly may occupy more space because of its wires and connector.
The net weight is approximately 10–12 grams, or 0.010–0.012 kg, depending on the specific assembly. Packaging dimensions should not be confused with the physical dimensions of the battery itself.
4. Product Applications
4.1 Industrial computer memory backup
The battery is used in compatible industrial computers where a battery-backed circuit requires power when the main computer supply is off.
Depending on the host design, the backed-up circuit may retain configuration information, clock settings, or other supported data. The exact function depends on the computer’s motherboard and memory architecture.
The battery does not power the complete computer and cannot keep the processor, display, or main operating system running during a power failure.
4.2 SIMATIC Box PC maintenance
The part is associated with selected Box PC 620, Box PC 627, Box PC 820, and Box PC 840 configurations.
During scheduled maintenance, a technician may replace the battery when indicated by a service warning, when the battery has reached the end of its expected service life, or when clock and retention-related problems suggest a battery issue.
The exact compatible hardware revision should be checked before replacement.
4.3 SIMATIC Panel PC maintenance
Selected Panel PC 670 and Panel PC 677 configurations are also listed among the compatible equipment families.
In a panel computer, the backup battery supports the relevant battery-backed circuits rather than powering the screen or the computer as a whole.
When replacing the battery, follow the equipment’s service instructions to avoid losing settings or damaging the connector.
4.4 Microbox PC applications
Selected Microbox PC 420 and related configurations are among the equipment families associated with this battery.
These computers may be used in industrial monitoring, machine control interfaces, data acquisition, or other software-based automation tasks. The battery’s role is limited to the backup function designed into the host computer.
4.5 Programming devices and maintenance workstations
Selected industrial programming devices may also use this battery type.
A battery-backed circuit can help preserve the information assigned to it while the device is switched off. This can be useful for equipment that is periodically powered down or moved between maintenance tasks.
5. Main Product Advantages
5.1 Compact design
The 1/2 AA format provides a compact backup-power source suitable for compatible industrial computer assemblies.
Its small size makes it possible to install the battery in equipment where space is limited. The exact mounting method and connector still need to match the host device.
5.2 Backup power for supported circuits
A correctly specified battery helps maintain the operation of the circuits intended to receive backup power when the main supply is disconnected.
This can help reduce problems associated with loss of retained information or clock settings, depending on the design of the computer.
5.3 Targeted maintenance
When the battery is the source of a retention-related problem, replacing the battery can be more economical and straightforward than replacing the entire industrial computer.
The repair is most effective when the battery has been correctly identified as the faulty component and the rest of the system is functioning normally.
5.4 Low weight
With a net weight of roughly 0.010–0.012 kg, the battery adds very little weight to the host equipment.
This makes it convenient for spare-parts inventory and maintenance kits, although storage and shipping procedures must still follow the applicable requirements for lithium batteries.
5.5 Compatibility with designated industrial computers
The part number identifies a battery assembly intended for selected SIMATIC industrial computers and programming devices.
Using the correct assembly helps avoid connector mismatches and electrical incompatibility. Compatibility should be confirmed against the exact computer model and hardware revision.
5.6 Simple replacement when service procedures permit
Battery replacement can be a relatively small maintenance task when the equipment has an accessible battery compartment or a documented service procedure.
However, some industrial computers require partial disassembly, and removing the battery may erase information stored in battery-backed circuits. Follow the equipment-specific procedure before disconnecting it.
6. Five Related Models or Compatible Equipment Families
The following five models are relevant because they belong to the industrial-computing equipment families associated with A5E00331143. They are host devices, not alternative battery part numbers.
The dimensions and weights of these historical computer families vary by hardware revision and installed configuration. Exact values should be obtained from the rating label or the mechanical specification of the particular unit.
| Model | Product series | Main parameters | Dimensions (W × H × D) | Weight (kg) |
|---|---|---|---|---|
| SIMATIC Box PC 620 | SIMATIC Box PC | Industrial box computer; internal battery provides backup for supported circuits; exact processor and memory depend on configuration | Exact version required | Exact version required |
| SIMATIC Box PC 627 | SIMATIC Box PC | Industrial computer for compatible automation and computing applications; battery compatibility depends on hardware revision | Exact version required | Exact version required |
| SIMATIC Box PC 820 | SIMATIC Box PC | Industrial box computer; configuration-dependent computing hardware and internal layout | Exact version required | Exact version required |
| SIMATIC Box PC 840 | SIMATIC Box PC | Industrial computing platform for selected automation and industrial software applications | Exact version required | Exact version required |
| SIMATIC Microbox PC 420 | SIMATIC Microbox PC | Compact industrial computer for compatible automation and data-processing tasks | Exact version required | Exact version required |
6.1 SIMATIC Box PC 620
The Box PC 620 is a relevant host-device family for identifying the correct battery replacement. Before ordering, check the computer’s full model designation and the battery connector installed in the unit.
6.2 SIMATIC Box PC 627
The Box PC 627 is another compatible equipment family identified for this battery. Because computer revisions can differ, confirm the original battery part number rather than relying solely on the model family.
6.3 SIMATIC Box PC 820
The Box PC 820 is a related industrial computer. If the battery is being replaced during an overhaul, inspect the connector, battery holder, and surrounding wiring for signs of damage.
6.4 SIMATIC Box PC 840
The Box PC 840 is another host-device family associated with the battery. The correct spare part should be selected according to the installed hardware revision and service documentation.
6.5 SIMATIC Microbox PC 420
The Microbox PC 420 provides a compact industrial-computing platform. The battery’s role remains limited to the backup function of its supported circuits.
7. Five Popular Siemens Automation Models
The following products are examples of other widely used Siemens automation equipment. They are not replacements for A5E00331143; they are included to provide a broader overview of related automation products.
| Model | Product series | Main technical parameters | Dimensions (W × H × D) | Weight (kg) |
|---|---|---|---|---|
| 6ES7214-1AG40-0XB0 | SIMATIC S7-1200 CPU 1214C | Compact PLC for machine automation; integrated I/O and communication features depend on the precise CPU version | Approx. 110 × 100 × 75 mm; verify exact variant | Approx. 0.4 |
| 6ES7511-1AK02-0AB0 | SIMATIC S7-1500 CPU 1511-1 PN | PLC with PROFINET communication for modular industrial control systems | Approx. 35 × 147 × 129 mm; verify exact variant | Approx. 0.6 |
| 6AV2124-0GC01-0AX0 | SIMATIC HMI TP700 Comfort | Operator panel for process visualization, alarms, and machine operation | Approx. 214 × 158 × 61 mm; verify exact variant | Approx. 1.5 |
| 6SL3210-1KE22-6AF1 | SINAMICS G120C | Compact variable-frequency drive for motor-speed control; voltage and power ratings depend on the exact variant | Exact variant required | Exact variant required |
| 6ES7155-6AU01-0BN0 | SIMATIC ET 200SP | Distributed I/O interface module for connecting field signals to a compatible controller | Approx. 50 × 117 × 74 mm; verify exact variant | Approx. 0.2 |
Dimensions and weights in this table are approximate reference values. Confirm the exact hardware revision before using them for cabinet layout, mechanical installation, or shipping calculations.
How these products relate to industrial computer maintenance
A PLC handles control logic, an HMI provides the operator interface, a variable-frequency drive controls a compatible motor, and distributed I/O connects field devices to the control system.
An industrial computer can run higher-level applications such as data logging, reporting, and visualization. The backup battery discussed in this document supports only the relevant battery-backed circuits in compatible host equipment.
The battery should therefore be selected based on the computer or device that requires it, not based on the wider automation system alone.
8. Installation and Maintenance Recommendations
8.1 Confirm the battery part number
Before ordering, check the original battery label and the host computer’s full model number. Confirm that A5E00331143 is the correct part for the specific hardware revision.
If the original battery has already been removed, consult the device’s maintenance documentation to establish the correct assembly.
8.2 Check voltage, chemistry, and polarity
Confirm the nominal voltage, battery chemistry, polarity, and connector arrangement before installation.
Never assume that every 3 V lithium battery is interchangeable. A cell with the wrong chemistry or wiring configuration may not work correctly and could damage the equipment.
8.3 Follow the computer’s service procedure
Shut down and isolate the equipment according to its service instructions before opening the enclosure.
Some battery-backed circuits may lose retained information when the battery is removed. If the device requires configuration backups or a particular replacement sequence, complete those steps before disconnecting the old battery.
8.4 Avoid charging the battery
A5E00331143 is a non-rechargeable primary battery. Do not attempt to recharge it or install it in a circuit intended for rechargeable cells.
Use only a replacement that meets the host equipment’s electrical requirements.
8.5 Check the connector carefully
Inspect the plug, wiring, and battery contacts before installation. Ensure the connector is seated correctly and that the cable is routed away from hot components, fans, and sharp edges.
Do not force a connector into place or modify the wiring unless the service documentation explicitly permits the modification.
8.6 Dispose of the old battery properly
Lithium batteries should be handled and disposed of in accordance with applicable battery-disposal procedures. Do not puncture, crush, burn, or short-circuit the battery.
Store replacement batteries in a suitable environment and follow the storage-temperature limits specified for the exact cell.
9. Frequently Asked Questions
Is A5E00331143 a PLC?
No. It is a lithium-metal CMOS backup battery used in compatible industrial-computing equipment.
What is the nominal voltage?
The nominal voltage is 3 V.
Is the battery rechargeable?
No. It is a non-rechargeable primary lithium battery.
What is the battery capacity?
The commonly specified replacement configuration is approximately 950 mAh. Actual capacity depends on the exact cell and its specification.
What are its dimensions?
The bare cell is approximately 14.45 mm in diameter and 25.3 mm in length. The complete assembly may be larger because of its connector and wires.
What is its weight in kilograms?
The net weight is approximately 0.010–0.012 kg, depending on the specific battery assembly.
Which devices may use this battery?
Associated equipment families include selected SIMATIC Box PC 620/627/820/840 models, Panel PC 670/677 models, Microbox PC 420 models, IPC427C, and certain programming devices. Compatibility must be confirmed for the exact hardware revision.
Can I replace it with an ordinary CR 1/2 AA cell?
Not necessarily. The original may include a connector and wiring designed for the host device. Confirm the required cell chemistry, voltage, polarity, dimensions, connector, and mounting arrangement before using a replacement.
10. Final Product Assessment
The Siemens A5E00331143 is a compact, 3 V lithium-metal CMOS backup battery in the CR 1/2 AA format, associated with selected SIMATIC industrial computers and programming devices.
Its main purpose is to provide backup power to supported circuits when the computer’s main power supply is off. Its advantages include a compact form factor, low weight, and the ability to replace a small maintenance component without replacing the entire host computer.
For purchasing and maintenance, the most important details are the exact battery chemistry, nominal voltage, capacity, connector, polarity, physical dimensions, and compatibility with the host computer’s hardware revision.
The related SIMATIC computer models listed above can help identify the equipment in which the battery may be used. The other automation models provide broader product-family context, but they are not alternative battery part numbers.