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EEMB: lithium thionyl chloride cells for alarms, meters, and sensors
EEMB ER batteries are 3.6V lithium thionyl chloride (Li-SOCl₂) cells: a specific chemistry designed to remain in service for years inside a device without being touched. These are the batteries used in burglar alarms and wireless sensors, gas and water meters, buffer memory on electronic boards, industrial instrumentation, Telepass units, and remote reading devices.
They have nothing to do with 3V CR coin cells: voltage and discharge curves are different, and installing one where a 3V battery is required may damage the electronics.
Size chart
| Code | Size | Capacity | Saft Equivalent |
|---|---|---|---|
| ER14250 | 1/2AA | 1200 mAh | LS14250 |
| ER14335 | 2/3AA | 1650 mAh | — |
| ER14505 | AA | 2400 mAh | LS14500 |
As with coin cells, the number represents the physical dimensions: 14 is the diameter in millimeters, and the following digits indicate the height in tenths of a millimeter.
The terminal matters as much as the code
The same cell exists in two versions: standard, to be inserted into the battery compartment, and with solder tags, intended to be fixed directly onto the electronic board. If the battery you are replacing was soldered, the standard version is of no use to you. This is the check to perform before ordering, along with the size.
Expert advice. For burglar alarms, meters, and systems with multiple sensors, it is advisable to replace all cells at the same time, even those that still seem good. Li-SOCl₂ batteries maintain a nearly flat voltage throughout their useful life and then drop suddenly: there is no gradual decline to warn you. A cell that is older than the others is simply the next one to fail, perhaps in a hard-to-reach sensor. If you cannot read the code on the old one, send us a photo and we will identify it for you.
Frequently asked questions
Are ER and LS the same thing?
They are the nomenclatures of two different manufacturers for equivalent lithium thionyl chloride cells: ER is the EEMB code, LS is the Saft one. An ER14250 and an LS14250 have the same 1/2AA size, the same 3.6V voltage, and aligned nominal capacity.
Can I use a 3.6V instead of a 3V?
No. Even when the size seems compatible, the 0.6V difference is outside the tolerance for most electronics and can damage the device. Li-SOCl₂ batteries should only be used where specified by the manufacturer.
Are they rechargeable?
No, they are primary batteries. Attempting to recharge them is dangerous: they can overheat and leak. If your device has a charging system, use a different type of battery.
How long do they last in a sensor?
It depends on the device's consumption, but the self-discharge rate of these cells is extremely low — on the order of 1% per year. This is precisely why they are chosen for applications where replacement is inconvenient or expensive.
How should they be disposed of?
In the appropriate containers for batteries and accumulators, never in the general waste. Separate collection is mandatory throughout the European Union.
See also lithium batteries and all batteries.
