Siemens 6EW1000-6AB Backup Battery

Technical Specifications and Battery Chemistry

This backup battery provides memory retention for Siemens PLC and CNC systems. The Siemens 6EW1000-6AB preserves user programs and critical parameters during power loss. You can install this unit in various Siemens controllers without special tools. Its compact cylindrical shape fits into dedicated battery compartments easily. The battery weighs approximately 0.05 kilograms. Its dimensions measure 4.5 cm in height and 1.8 cm in diameter.

Parameter	Specification
Brand	Siemens
Model	6EW1000-6AB
Category	Backup Battery / Memory Retention Battery
Weight	0.05 kg (50 grams)
Height	4.5 cm
Diameter	1.8 cm
Battery Chemistry	Lithium / Thionyl Chloride (Li-SOCl₂)
Nominal Voltage	3.6V DC
Nominal Capacity	2.1 Ah (2100 mAh)
Terminal Type	2-pin JST connector (150 mm wire leads)
Self-Discharge Rate	Less than 1% per year
Operating Temperature	-40°C to +85°C
Storage Life	Up to 10 years (unused)
Shelf Life (Installed)	5 to 7 years typical
Energy Storage	7.56 watt-hours total
Component Count	Single lithium cell with attached wiring harness

Chemical Composition and Safety Features

The battery uses lithium thionyl chloride chemistry for high energy density. This chemistry provides stable voltage output throughout the discharge cycle. The Siemens 6EW1000-6AB includes internal pressure relief protection. A safety vent prevents catastrophic failure under abnormal conditions. You must never attempt to recharge this non-rechargeable battery. Recharging will cause leakage or violent rupture. The cell meets IEC 60086-4 safety standards for lithium batteries.

Compatibility and System Integration

This battery replaces original Siemens memory backup units in many controllers. You will find it in Siemens S5 PLCs and older CNC systems. The two-pin JST connector matches the onboard battery header perfectly. The 150 mm wire leads allow flexible positioning inside crowded cabinets. You should verify your device requires a 3.6V lithium backup battery. Some models use a different voltage or connector type instead. The Siemens 6EW1000-6AB cannot power any external device or load.

Installation and Replacement Guidelines

You must replace this battery with the controller power turned ON. Power loss during battery replacement will erase all stored memory. Therefore, follow the manufacturer’s hot-swap procedure carefully. You should record all critical program parameters before starting the replacement. Dispose of the old battery according to local hazardous waste regulations. Do not incinerate or short-circuit the battery terminals under any circumstances. A low battery warning on the controller indicates replacement time approaches.