Q&A: Energizer's Safer Coin Batteries Explained

Coin batteries are a common power source for small electronics, but they pose a hidden danger: if swallowed and stuck in the esophagus, they can cause severe internal burns. Energizer has addressed this with its new Ultimate Child Shield line, claiming it's the first to eliminate ingestion burn risk. Below, we answer key questions about this innovation.

• What did Energizer announce?
• How do regular coin batteries cause harm if swallowed?
• What makes the new Energizer batteries different?
• Which sizes are available and what devices use them?
• Are these batteries completely safe to swallow?
• How do they work at a technical level?
• When are they available and where?
• What is the significance for parents?

What did Energizer announce?

Energizer introduced a new line of lithium coin batteries called Ultimate Child Shield. The company claims these are the world's first coin batteries that completely eliminate the risk of ingestion burns if swallowed. The line includes three popular sizes—2032, 2025, and 2016—which are commonly used in devices such as remote controls, wearables, and tracking gadgets like Apple's AirTags.

How do regular coin batteries cause harm if swallowed?

Most swallowed batteries pass through the digestive system without issue. However, if a battery becomes lodged in the esophagus, it becomes more than a choking hazard. The battery's positive and negative terminals can create an electrical current when in contact with saliva. This current triggers a chemical reaction that generates hydroxide ions, leading to tissue burns in as little as two hours. The damage can be severe and even life-threatening if not treated promptly.

What makes the new Energizer batteries different?

The Ultimate Child Shield batteries incorporate a proprietary safety coating on the exterior. This coating is designed to prevent the generation of an electrical current when the battery comes into contact with moist tissue, such as the esophagus. By blocking the current, the chemical reaction that causes burns is avoided, even if the battery gets stuck. This marks a significant advancement in battery safety technology.

Which sizes are available and what devices use them?

The three available sizes are CR2032, CR2025, and CR2016. These are among the most common coin battery sizes found in household items: remotes, key fobs, thermometers, fitness trackers, and smart tags like Apple's AirTags. The 2032 is the thickest and most widely used, while the 2025 and 2016 are thinner and often used in slimmer devices.

Are these batteries completely safe to swallow?

No battery is safe to swallow. While the Ultimate Child Shield eliminates the risk of ingestion burns, choking remains a serious hazard. Batteries are still small objects that can obstruct airways, especially in young children. Energizer emphasizes that these batteries should still be kept away from children and used with proper precautions. The safety improvement targets the chemical burn risk, not the physical choking danger.

How do they work at a technical level?

The exact mechanism is proprietary, but the batteries feature a special coating that insulates the terminals when in contact with bodily fluids. Typical coin batteries have exposed metal on the edge and face; when saliva bridges the positive and negative surfaces, current flows. The new coating prevents this bridging effect, effectively disabling the battery's electrical output under those conditions. Under normal use in a device, the coating allows standard electrical contact via the device's terminals.

When are they available and where?

Energizer launched the Ultimate Child Shield line starting today. The batteries are available at major retailers such as Amazon, Walmart, and CVS, as well as directly from Energizer's website. Pricing is slightly higher than standard coin batteries due to the advanced safety technology, but the company expects widespread adoption given the enhanced safety.

What is the significance for parents?

For parents and caregivers, this innovation offers greater peace of mind. Every year, thousands of children swallow coin batteries, leading to emergency room visits and severe injuries. While adult supervision remains essential, Ultimate Child Shield significantly reduces the worst-case scenario of internal burns. However, experts still recommend storing batteries out of reach and using child-proof compartments in devices.