How to Use Emerson Lithium-Ion Batteries in Industrial Devices

Most battery failures in industrial equipment are not battery failures at all. They are installation failures, application mismatches, or maintenance gaps that show up as a dead battery. If you are sourcing or deploying Emerson lithium-ion batteries for PLCs, RTUs, flow computers, or field instruments, the battery itself is rarely the variable. How it is specified, installed, and managed is what determines whether it lasts two years or eight.

This guide covers what actually matters when putting Emerson lithium-ion batteries into industrial devices, from application fit to field replacement.

Where Emerson Lithium-Ion Batteries Are Used in Industrial Applications

Emerson produces lithium-ion and lithium primary battery solutions across several product families, including those used in their Fisher, Rosemount, and Remote Automation Solutions (RAS) equipment. These batteries power a specific category of industrial need: memory retention, wireless communication, and low-power field devices that cannot be hardwired for practical or cost reasons.

The most common deployment scenarios are:

PLC and RTU memory backup, where the battery maintains SRAM data and the real-time clock during a power loss
Wireless field instruments, including WirelessHART transmitters that run entirely on battery power
Flow computers and gas chromatographs in remote pipeline locations where grid power is unavailable
Smart positioners and valve controllers that use battery-backed diagnostics and position memory

Each of these roles has different power draw characteristics, different temperature exposure, and different replacement logistics. The same battery chemistry does not automatically suit all of them equally well.

Lithium-Ion vs. Lithium Primary: Know the Difference Before You Order

This distinction matters more than most procurement teams realize, and confusing the two can damage equipment.

Emerson's industrial battery products include both lithium primary cells (non-rechargeable, lithium-thionyl chloride or lithium manganese dioxide chemistry) and lithium-ion rechargeable packs. They are not interchangeable, and the application determines which category is correct.

Lithium primary cells are used in low-power, long-life applications like wireless transmitters and memory backup. They are not rechargeable. Attempting to recharge a primary lithium cell is a safety hazard. Their advantage is energy density and a flat discharge curve that holds voltage stable until near end of life.

Lithium-ion rechargeable packs appear in devices that have integrated charging circuits, such as handheld communicators, portable calibration tools, and some advanced field devices. These require a compatible charging source and have defined charge cycle limits.

Before ordering a replacement, confirm which chemistry the device requires. The device manual or nameplate will specify it. Do not substitute based on physical fit alone.

Reading the Device Specification Before Anything Else

Every Emerson device that uses a battery will have a battery specification in the installation manual or the product datasheet. That specification defines:

Nominal voltage and capacity (mAh or Ah)
Approved battery part numbers or chemistry types
Operating temperature range for the battery, which may differ from the device's rated range
Expected service life under defined conditions
Replacement interval, if the manufacturer specifies one

The battery spec in the manual is not a suggestion. It is the result of Emerson's engineering testing for that specific device. Deviating from it without a verified equivalent puts the device warranty, and in some cases the device itself, at risk.

Pull the manual before procurement. It takes five minutes and prevents the more expensive problem of installing an incorrect battery in a field device that is hours away from the nearest town.

Installation: What to Get Right the First Time

Handle Lithium Batteries Correctly

Lithium batteries, both primary and ion, require basic handling discipline. Do not short the terminals. Do not expose to temperatures above the rated storage maximum before installation. Do not install a battery that shows signs of swelling, leakage, or physical damage.

A damaged lithium cell installed into a sealed enclosure in a classified area is a serious safety risk, not just an equipment concern.

For WirelessHART and similar field instruments, the battery is typically the only energy source. Installing a partially discharged battery because it was stored improperly cuts the service interval from years to months, and you will not know it until the device drops off the network.

Observe Polarity and Connector Orientation

In devices where the battery connects via a harness or connector, the connector is usually keyed to prevent reverse insertion. Do not force a connector that does not seat easily. In devices with exposed terminals, double-check polarity against the marking in the battery compartment before closing the enclosure.

Reverse polarity on a lithium primary cell will not necessarily trigger an immediate failure. It may cause a slow internal discharge or damage the protection circuitry, and the device will behave normally for a short time before failing unpredictably.

Follow the Purge and Isolation Procedure in Hazardous Areas

For devices installed in Class I Division 1 or 2 areas, or ATEX Zone 1 or 2 locations, battery replacement is a hot-work or cold-work procedure depending on the device certification and site safety plan.

Never open an explosion-proof or intrinsically safe enclosure to replace a battery without following the site's area classification procedure. The field device's Ex rating applies to the complete installed assembly, not just the enclosure body.

Confirm with the site safety officer whether the area needs to be de-classified or whether the device's IS certification permits open-face battery swap under normal conditions. This is not a step to assume.

Temperature: The Factor That Determines Real Service Life

Rated battery life figures in Emerson documentation assume operation within the specified temperature range. In practice, field devices sit in conditions that challenge those figures on both ends.

Cold reduces available capacity. Heat accelerates aging. Neither effect is linear.

At temperatures below 0�C, lithium primary cells lose a significant portion of their usable capacity. A transmitter in a northern Alberta installation that is rated for a five-year battery life under standard conditions may see that interval cut to two or three years if it spends winters at minus 30�C with regular low-temperature polling cycles.

At high temperatures, above 60�C sustained, lithium-ion cells degrade at an accelerated rate. If a device is mounted on or near heat-generating equipment, the ambient temperature at the battery may be substantially higher than the ambient air temperature of the plant.

Account for the actual installation environment, not the general site temperature, when estimating replacement intervals. For remote sites with long mobilization times, conservative replacement scheduling is cheaper than emergency callouts.

Wireless Instruments: Managing Battery Life Across a Network

WirelessHART instruments running on Emerson battery packs report their battery status as part of the HART protocol. The host system, whether it is a DeltaV system, a third-party SCADA platform, or an AMS Device Manager installation, can read and trend battery voltage or estimated life remaining.

Use that data. Set up an alert at a reasonable threshold, typically 20% estimated life remaining, so that battery replacements can be scheduled during planned maintenance windows rather than after an unplanned device dropout.

A WirelessHART network with 40 field devices and no battery monitoring strategy is a network that will surprise you. The surprises are always inconvenient.

Update Rate and Power Consumption

The update rate configured on a WirelessHART transmitter directly affects battery drain. A device publishing at a one-second update rate will exhaust its battery far faster than one publishing at 30-second or one-minute intervals. For process variables that change slowly, such as a tank level in a non-critical buffer vessel, there is no operational reason to poll at a high rate.

Review the update rates on all battery-powered wireless devices as part of commissioning. Align the rate to the actual process need, and you will extend battery service intervals across the network without changing a single cell.

Replacement Logistics and Spare Parts Planning

Keep Approved Spares On-Site

For any facility with more than a handful of battery-powered field devices, maintaining an on-site spare battery inventory is basic operational practice. The quantity should be based on the replacement frequency and the mobilization time for off-site procurement.

Do not rely on expedited shipping from a distributor for a time-critical replacement. Lead times on specific Emerson battery part numbers can vary, and the part you need is rarely the one that ships overnight.

Store spares in the original packaging, within the specified temperature and humidity range, away from direct sunlight. Most lithium primary cells have a shelf life of ten years from manufacture under correct storage conditions. Buying in quantity and rotating stock is a reasonable strategy for high-volume installations.

Source from Authorized Supply Channels

Counterfeit lithium cells exist in the industrial supply chain. They are manufactured to look identical to the OEM part, right down to the part number printing and the hologram labels on some products. The difference shows up in actual capacity, internal resistance, and in some cases, thermal stability.

A battery that measures the correct open-circuit voltage on arrival is not necessarily genuine. Capacity and internal resistance testing under load will reveal a counterfeit where a simple voltage check will not.

Source Emerson battery replacements from authorized distributors. Request a certificate of conformance on large orders. If a price seems dramatically below the market rate for a genuine Emerson part, treat that as a red flag, not a procurement win.

Documenting Replacements in the Maintenance System

Every battery replacement should be logged in the CMMS or maintenance management system with the date, device tag, part number installed, and the technician who performed the work. This creates the data needed to track actual versus expected service life, identify devices in abnormal conditions, and defend maintenance decisions if an instrument failure becomes a regulatory or insurance matter.

Good maintenance documentation is invisible when things go right. It is invaluable when something goes wrong.

Disposal and Regulatory Compliance

Lithium batteries, primary and ion, are regulated waste in most jurisdictions. They cannot go into general site waste streams. Emerson and most OEM suppliers provide guidance on disposal or recycling options.

For sites operating under ISO 14001 or similar environmental management systems, battery disposal must be tracked. Set up a collection point for spent batteries, document quantities, and use a licensed recycler. The volumes involved in most industrial installations are small enough that this is not logistically difficult. It just needs to be part of the procedure.

Lithium primary cells in particular must not be incinerated. Some chemistries can release toxic gases if burned. Follow the SDS (Safety Data Sheet) for the specific chemistry being disposed of.

Common Mistakes That Shorten Battery Service Life

These are the patterns that come up repeatedly in industrial environments where battery-powered instruments are underperforming.

Installing a battery that has been stored outside the recommended temperature range
Using a non-approved chemistry or capacity because the approved part was not available
Configuring high update rates on wireless devices without a process requirement to justify them
Skipping loop tests after battery replacement, assuming the device will come back correctly
Not adjusting replacement intervals to reflect actual installation temperature conditions

None of these mistakes are dramatic. They are the kind of small decisions that seem reasonable in the moment and show up as reliability problems six months later.

If you need help sourcing verified Emerson batteries or planning replacements for a fleet of field devices, reach out through TechnoControlCorp to discuss your requirements.