Factory Supply ER18505M 3.6V Lithium Thionyl Chloride Battery -55°C to +85°C Operating

We've been shipping these ER18505M cells for a while now, and they're a solid fit for metering and tracking gear that sits in harsh conditions, like oil well monitors or remote sensors where swapping batteries isn't practical. The Li-SOCl2 chemistry gives you that flat 3.6V discharge curve, which basically means your device sees consistent power until it's dead, and the 3500mAh capacity holds up well even with the 500mA continuous draw limit.

Operating range from -55°C to +85°C is what you'd expect from this chemistry, but the real trick is storage—keep them at -20°C to +60°C or so, ideally around 20°C, and you'll get full 10-year shelf life. We've had batches sit for 8 years and still test above 90% capacity on HPLC, though pulse current up to 1000mA (for under a second) is fine for most start-up loads. The 18mm diameter and 50.5mm height mean they fit standard holders, but the radial leads can be a pain if your PCB layout is tight—check the terminal spacing before you design in bulk.

Actually, one buyer we work with uses these in avalanche beacons, and the low self-discharge rate—roughly 1% per year at room temp—is why they chose it over nickel-based cells that'd need replacement every season. Not suited for high-drain devices like GPS trackers with frequent transmissions, though; the internal impedance climbs at low temps, so voltage sag can trigger brownouts if you're pulsing too hard. Most procurement folks go with the standard radial leads, but we can do custom tabs if your volume justifies the tooling change.

We include a COA with every shipment, and the CE, RoHS, UN38.8, and MSDS docs are bundled—though the UN38.8 test report is specific to the batch number, so confirm lead time if you need it updated. 3500mAh is the nominal capasity, but we've measured actual discharge at 3450mAh to 3520mAh depending on the load profile; the 29g ±1g weight is consistent across. Our QC flags any cell with votage below 3.4V after 30 days of storage, which is tighter than the of 3.0V.

Payment terms are typically 30% deposit with the balance on shipment for first-time orders, but our company can negotiate net 30 after three clean transactions—MOQ is usually 500 units, though we've done 200 for a test run if you cover the setup fee. Shipping is via DDP for most destinations, and we'll arrange the IATA paperwork for the lithium metal classification (Class 9) at no extra charge. Stock levels fluctuate, but we usually have 2,000 to 5,000 cells on hand, so lead time is about 20 days or so form order confirmation.