---
title: ER Cells | Ultralife Corporation
description: ULTRALIFE’s non-rechargeable batteries offer industry-leading performance, from ultra-thin to high-capacity cells—built for extreme conditions and long-term reliability.
---

![ultralife-logo-transparent](https://info.ultralifecorporation.com/hs-fs/hubfs/ultralife-logo-transparent.png?width=308&height=50&name=ultralife-logo-transparent.png "ultralife-logo-transparent")

# ER Cylindrical (Li/SOCl₂) Batteries

![ER-Cylindrical](https://info.ultralifecorporation.com/hs-fs/hubfs/ER-Cylindrical.png?width=236&height=150&name=ER-Cylindrical.png "ER-Cylindrical")

When performance matters, Ultralife’s ER Cylindrical Lithium Thionyl Chloride (Li/SOCl₂) cells deliver. Whether your priority is **maximum capacity** or **high power output**, our ER series offers flexible, high-density solutions tailored for mission-critical applications.

[Speak With An Engineer](https://info.ultralifecorporation.com/er-cells#form)

## Built by Engineers, For Engineers

![industries-served](https://info.ultralifecorporation.com/hs-fs/hubfs/industries-served.png?width=427&height=125&name=industries-served.png "industries-served")

At Ultralife, we specialize in custom and standard battery packs designed to meet your unique needs. Our strength lies in deep technical expertise, collaborative problem solving, and our ability to deliver application-specific energy solutions—no matter the complexity. 

## Why Choose ER Cylindrical Cells?

## Ultralife’s ER Cylindrical cells are built for performance in the harshest conditions, offering industry-leading reliability and power consistency. Whether you need immediate stock or scalable production, our solutions are ready to meet your critical energy demands with speed and confidence.

- Up to 30% More Capacity
- Ultra-High Energy Density
- Wide Temperature Range

- Non-Flammable Electrolyte for Enhanced Safety
- Off-the-Shelf Availability
- Short Lead Times

## ER Cell Product Families

## Ultralife’s ER Generation X cells deliver up to 30% more capacity and 400 Wh/Kg energy density in compact bobbin or spiral designs—ideal for metering, communications, security systems, and more, with built-in safety and certified reliability.

#### **ER Generation X**

- High and stable operating voltage
- Superior current capabilities
- Low self-discharge rate

![ER-Generation-X](https://info.ultralifecorporation.com/hubfs/ER-Generation-X.jpg "ER-Generation-X")

[Learn More](https://ultralifecorporation.com/battery-energy/lithium-cells/er-generation-x/)

**ER Generation X2**

- Designed for gas metering and hazardous environments
- Includes safety venting for added protection

![ER-Generation-X2](https://info.ultralifecorporation.com/hubfs/ER-Generation-X2.jpg "ER-Generation-X2")

[Learn More](https://ultralifecorporation.com/battery-energy/lithium-cells/er-generation-x/)

### When Failure Isn’t an Option, Bring in the Experts

Mission-critical ER cell systems demand more than just battery expertise. From long-life design optimization to system integration and scalable manufacturing, we engineer solutions built for reliability in the world’s most demanding applications.

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Ready to Find the Right Power Solution for Your Application? Our Experts Are Here to Help.

[Speak With An Engineer](https://info.ultralifecorporation.com/er-cells#form)

## Speak With Our Applications Engineers Today

Complete the form below to connect with our engineering team. We’ll help you find the ideal ER solution for your application.

North America Phone:  [+1 (315) 332-7100](tel:315-332-7100)  |  UK/Europe Phone:  [+44 1782 566 688](tel:441782566688)  
Copyright © 2026, Ultralife Corporation