The EVE ER14505V is the standard cell for battery-powered IoT devices – and by some distance the best-selling battery in our range. Lithium thionyl chloride instead of alkaline means it lasts years rather than months, works from polar frost to full summer sun, and loses almost no charge on the shelf. That is precisely why it sits inside the vast majority of LoRaWAN sensors we ship. Worth knowing: it is not rechargeable and delivers 3.6 volts rather than the 1.5 volts of an AA alkaline cell – so it does not replace an ordinary AA and belongs only in devices built for this cell type. We stock it as a standing item and deliberately supply fresh stock.

• 3.6 Vnominal voltage
• 2600 mAhcapacity in practice
• −60 … +85 °Coperating temperature
• below 2% / yearself-discharge
• AA size14505, without solder tags

Why this cell sits inside IoT devices

• Ten years in the device is realistic: self-discharge is far below that of alkaline cells. A sensor transmitting hourly comfortably outlives a decade – usually it is not the battery that gives up first, but the project.
• The voltage stays stable to the end: alkaline cells decline continuously; this cell holds its voltage almost until exhaustion. For the electronics that means constant transmit power across the whole service life.
• Cold does not bother it: specified down to −60 °C. An alkaline cell is practically dead at −20 °C; that is exactly why cheaply fitted outdoor sensors fail in the first cold winter.
• Fresh stock, not shelf-warmers: we watch for a production date less than a year old. For a cell chemistry that lives off long shelf life this is no detail: every year in storage comes off the service time in the device.
• Robust construction: stainless steel case with a hermetic glass-to-metal seal – tight, leak-proof and insensitive to shock.
• Standard version without terminals: this variant has ordinary poles and fits any AA battery holder. Versions with solder tags or pins are available on request.

Where it is used

• LoRaWAN sensors: the classic – environmental, fill-level, temperature and door sensors use this cell almost throughout, many of them two in series or parallel.
• Utility meters: water, gas and heat meters with radio read-out, where a battery change would disturb the calibration cycle.
• Trackers and locating devices: asset tracking over years without charging infrastructure.
• Alarm and security equipment: smoke detectors, emergency call buttons and door contacts that have to work when it matters – even after years on standby.
• Data loggers and memory backup: anywhere a clock or a memory has to keep running without mains power.
• Replacement supply in a rollout: anyone operating hundreds of sensors plans the battery change as a maintenance item. We supply the quantity needed and keep the item permanently in stock.

That settles the selection. What follows is the knowledge that makes the difference in operation.

Two quirks worth knowing

Passivation – why a cell seems “weak” although it is full: lithium thionyl chloride cells form a thin protective layer on the lithium during storage. That layer is exactly what makes the extremely low self-discharge possible. On the first current draw the voltage therefore dips briefly before recovering within seconds to minutes. Some devices read this as a flat battery and report a fault. It is not a defect: the layer breaks down by itself under load. Cells stored for longer need a correspondingly longer run-up – another reason why we watch for fresh stock.

The stated capacity depends on the discharge current: the datasheet quotes 2.7 Ah, measured at just 1 mA. In practice you reckon on around 2600 mAh, and at higher currents the usable figure drops further. The manufacturer recommends a maximum of 40 mA continuous. The short transmit peaks of a LoRaWAN module exceed that – which is why many devices put a buffer capacitor or a hybrid cell in front. If you are building your own hardware: this cell is made for small continuous currents and short pulses, not for continuous load.

And a consequence for operation: because the voltage stays almost constant to the end, it is of little use as a fuel gauge. A sensor reporting 3.6 volts may run for years more – or fail in a fortnight. Anyone running many devices therefore plans the change by operating time rather than by reported voltage.

Technical data

The general product data – size, weight, manufacturer part number, EAN – is in the detail table further down this page.

Safety and disposal

Do not charge, do not short-circuit, do not open, do not heat above 100 °C and do not throw into fire – with lithium primary cells this is not a formality but a genuine fire and chemical burn hazard. Store cells individually with the poles taped over so they cannot short against each other. When replacing, always change all cells in a device together and never mix old with new or different makes: the weaker cell would otherwise be deep-discharged by the stronger one. Spent cells belong in battery collection – in Switzerland every point of sale takes them back, ourselves included of course.

Help with the selection

The manufacturer’s datasheet is under the Documents tab at the top of this page. Not sure which cell belongs in your device, or need larger quantities for a rollout? Talk to us – we know what most of the sensors we carry are fitted with. For sizing, pre-configuration and commissioning we will gladly put together a quote.