PKCell compares ER26500 and ER34615 batteries for smart metering

PKCell says two lithium thionyl chloride battery models, ER26500 and ER34615, serve different smart meter deployment needs based on size, capacity and pulse-handling performance. The comparison highlights how battery selection can affect installation fit, service life and total cost in utility networks.

Why it matters: - Smart meters, gas stations and remote utility systems depend on primary lithium batteries that can run for years without intervention. - Battery choice affects enclosure fit, transmission reliability, maintenance frequency and total cost of ownership over a 10- to 15-year deployment. - Choosing the wrong cell can force costly field visits, housing redesigns or early replacement.

What happened: - PKCell, also known as Shenzhen Pkcell Battery Co., Ltd., published a comparison of the ER26500 and ER34615 Li-SOCl2 battery models for smart metering applications. - The company framed the two cells as leading options for utility meter designers working with space constraints, pulse loads and long-life deployment targets. - The article was published in Shenzhen, Guangdong, China, on Aug. 5, 2026.

The details: - The ER26500 is a C-size cell measuring 26.2 mm in diameter, 50.0 mm tall and weighing about 55 grams. - The ER34615 is a D-size cell measuring 34.2 mm in diameter, 61.5 mm tall and weighing about 107 grams. - The ER26500 has an approximate capacity of 9,000 mAh under low-current discharge. - The ER34615 has an approximate capacity of 19,000 mAh under low-current discharge. - Both cells use lithium thionyl chloride chemistry with a nominal voltage of 3.6V. - Li-SOCl2 cells are described as having high energy density, a flat discharge curve and annual self-discharge below 1% under normal storage conditions. - A passivation layer on the lithium anode helps reduce self-discharge but can create voltage delay when a device wakes up to transmit data. - The ER34615’s larger electrode surface helps it handle transient current demands and recover voltage faster after transmission bursts. - The ER26500 can show a longer recovery period, especially in cold-climate installations. - For designs that need ER26500 capacity but stronger pulse support, PKCell offers a 1S4P pack using four ER26500 cells. - That custom pack is rated at 36,000 mAh and is designed for low-profile housing layouts. - NB-IoT deployments were identified as a better fit for the ER34615 because cellular broadcast cycles draw multi-ampere pulse currents. - LoRaWAN and wM-Bus applications were positioned as better matches for the ER26500 because their power budgets are lower. - Compact water meter installations can favor the ER26500 when enclosure space is tight. - Remote gas pipeline monitoring can favor the ER34615 because service visits are expensive and difficult to schedule. - PKCell says it uses automated cell-matching algorithms that check open-circuit voltage and internal resistance before packaging cells for multi-cell configurations. - PKCell says it uses automated spot welding and laser micro-welding to reduce thermal stress and improve connection consistency. - PKCell says every production batch goes through capacity grading before shipment. - The company lists ISO 9001, CE, IEC 60086-4 and RoHS compliance, with third-party verification. - The company provided a corporate website at More information. - PKCell also listed a Facebook page at Social media page.

Between the lines: - The comparison is less about which battery is universally better and more about matching chemistry, size and pulse behavior to the meter’s actual duty cycle. - PKCell is positioning manufacturing consistency and certification coverage as part of the product value, not just the battery specifications themselves. - The emphasis on multi-cell pack matching suggests the company is targeting utility customers that need standardized supply across large endpoint fleets.

What's next: - Utility manufacturers will likely choose between the two models based on enclosure depth, transmission frequency and service-access costs. - Projects that need both compact form factor and higher capacity may move toward custom parallel-pack designs. - Broader deployment decisions will likely depend on how well the selected cell holds performance across temperature swings and long operating cycles.

The bottom line: - ER26500 fits tighter spaces and lower-power networks; ER34615 delivers more capacity and stronger pulse support for heavier-duty smart metering use cases.