Switching from Lead-Acid to Lithium? Here’s What OSHA Wants You to Know

OSHA also points to national consensus standards from UL, NFPA and FM Global as benchmarks for safe design, installation and storage. Your existing safety program still applies; it just needs updating for a different chemistry.

Storage: think about quantity and location

With lead-acid, storage concerns centered on acid spills. With lithium-ion, the bigger concern is fire. A damaged or defective cell can overheat and trigger thermal runaway, which can spread to nearby batteries.

That's why OSHA recommends limiting how many lithium-ion batteries are stored in one place, following NFPA 800 (Battery Safety Code) and NFPA 855 (Standard for the Installation of Stationary Energy Storage Systems). Review where spare batteries are kept and how many are grouped together, keep damaged or end-of-life batteries separate, and check with your local fire authority and insurer for any added requirements.

Charging areas: follow the manufacturer's instructions

OSHA's control guidance includes following the manufacturer's instructions for storage, use, charging and maintenance. With lithium-ion, the charger and battery management system work together to keep each cell within safe voltage, current and temperature limits, so a mismatched or misconfigured charger can undermine that protection.

OSHA also recommends eyewash stations and safety showers wherever workers could be exposed to battery electrolyte. If you're reusing an old lead-acid charging room, confirm the setup fits the new chemistry rather than assuming it carries over.

Hazard communication: know what your batteries contain

OSHA notes that the most common electrolyte salt, lithium hexafluorophosphate, can react with water to form hydrogen fluoride (HF), a toxic gas. Many battery chemicals are also relatively new, so established exposure limits may be limited.

Under OSHA's Hazard Communication Standard, manufacturers must classify chemical hazards for batteries that don't qualify for the "article" exemption, and OSHA has issued several letters of interpretation on the topic. In practice, make sure you have current safety data for every battery you use, and update training and emergency plans to cover lithium-ion.

Why a matched system helps

When the battery, charger and battery management system come from different suppliers, "follow the manufacturer's instructions" can mean juggling three sets of instructions. When they're designed together, there's one, and the charger can communicate with the battery and stop before safe limits are exceeded.

That matters because lithium-ion safety isn't determined by cell chemistry alone. It comes from the whole system: quality cells, redundant monitoring, a battery management system, fuses and contactors, thermal barriers, a protective enclosure and an integrated charger, each adding its own layer of protection.

Micropower's LionBRIX systems take this approach, with more than 2 million modules delivered since 2017 and zero reported safety incidents. No product replaces a strong safety program, but a matched system takes much of the guesswork out of following OSHA's guidance.

Your transition checklist

• Review OSHA's page and fact sheet with your safety team.
• Check battery storage quantities and locations against NFPA 800 and NFPA 855.
• Confirm chargers are approved by the battery manufacturer and configured correctly.
• Revisit former lead-acid charging areas, including eyewash and safety shower placement.
• Get current safety data for every battery type you use.
• Update hazard communication training and emergency plans for lithium-ion, including HF exposure.
• Set a plan for separating damaged batteries and recycling at end of life.

Planning your transition? Contact Micropower to talk with our team about a battery and charging system built for your equipment.