Lithium-Ion Battery Charging Area Requirements at Work

Does the battery charging standard even apply?

8 CCR 5185, Changing and Charging Storage Batteries, is the section everyone reaches for. It was last amended in 2015 and it is written around flooded lead acid cells. It contains no occurrence of lithium, lithium-ion or thermal runaway.

Some of it still lands. Some of it cannot land, because the condition it depends on does not exist in a sealed pack.

Subsection Applies to a sealed lithium-ion pack?
(b) charging in designated areas, employees qualified and instructed in emergency procedures Yes. This one carries most of the weight and is the provision we cite most.
(c) ventilation to prevent accumulation of flammable gas and corrosive mist Arguably. The gas is no longer charging hydrogen, it is thermal runaway vent gas. Different gas, same principle.
(d) means to neutralize or dispose of spilled corrosive liquid No spill to neutralize in a sealed pack.
(e), (f), (g), (h) electrolyte dispensing, mixing, hydrometer use, storage Not applicable. There is no electrolyte to handle.
(i) protection of charging apparatus from mobile equipment Yes.
(j) mechanical lifting devices for battery handling Yes, and more so. Lithium traction packs are heavy and awkward.
(k) no smoking in charging areas Yes.
(l) precautions against static discharge, open flame, sparks and arcs Yes.
(m) vent caps kept firmly in place when charging batteries with vent caps A sealed pack can neither satisfy nor violate this.
(n) eye and body drenching facilities, with an exception for closed systems The closed system exception is the live question. We have asked Cal/OSHA.
(q) personal protective equipment per Section 3380 Yes, though what is appropriate changes.

We put this question to Cal/OSHA Consultation in writing on 10 September 2026 and we will publish their answer here rather than paraphrase it. Nobody appears to have asked.

If 5185 only half applies, what carries the duty?

Three sections and the manufacturer document, and this is the combination we write into client programs.

  • 8 CCR 3203, the Injury and Illness Prevention Program. The general duty to identify and evaluate workplace hazards and correct them. A new energy storage hazard introduced to a site is squarely an IIPP matter, and the hazard evaluation should be written down and dated.
  • 8 CCR 3221, the Fire Prevention Plan. Subsection (b)(1) requires you to name the fire hazards, the ignition sources, their control procedures and the type of fire protection equipment that can control a fire involving them.
  • 8 CCR 3220, the Emergency Action Plan. What happens once it starts. We set the required elements out line by line on the emergency action plan page.
  • The manufacturer's own document for that pack. Attached to the program, not referenced in the abstract. Where manufacturers conflict, and they do, the one that governs is the one for the battery you own.

What should actually be at the charging area?

Working from what the published sources support, and labeled where a point is our judgment rather than a requirement.

  1. A designated area, marked. 5185(b) requires charging in designated areas. Mark it and keep the marking current when the area moves, which on a job site it will.
  2. Clear space around the pack. Nothing combustible adjacent. The extinguisher present is there for the surrounding materials, so the fewer surrounding materials the better. That is the cheapest control on this list and the one most often ignored.
  3. An ABC dry chemical extinguisher, correctly understood. CAL FIRE Information Bulletin 26-007, 28 August 2026, calls for one to "prevent the spread of fire to surrounding materials such as paper, cardboard, and plastics," while stating that no ANSI or UL standard exists for listing extinguishers to put a lithium-ion battery out. Post what it is for.
  4. A route out that does not run past the charger. Our judgment, and it is the first thing we look at on a walkthrough.
  5. The manufacturer document, physically present. Not in a binder in the trailer office. Where the fire service will look.
  6. No charging unattended overnight where the published guidance advises against it. Follow the manufacturer instruction for that pack; several are explicit about it.

Are there specific temperature limits for charging?

For consumer scale batteries California publishes a number. CAL FIRE Information Bulletin 26-007 advises keeping batteries at room temperature away from heat and direct sunlight, and not charging them "at temperatures "below 32°F (0°C) or above 105°F (40°C)."

Do not transfer that figure to a traction pack without checking. That bulletin is written around home electronics and personal micro-mobility devices. Industrial packs have their own stated operating and charging windows and their own battery management systems, and the correct number is the one in the document for your pack. We flag the consumer figure because for tool batteries in a hot job trailer it is directly on point, which we cover on the tool battery page.

How this page was verified

Section 5185 was read subsection by subsection on the Department of Industrial Relations site on 11 September 2026, and searched for lithium, lithium-ion and thermal runaway, none of which appear in it. Sections 3203, 3220 and 3221 were read in the same pass. The CAL FIRE quotations were extracted from Information Bulletin 26-007 itself. Where we give our judgment rather than a requirement, the page says so.

Every regulation quoted on this page was read in the original on the Department of Industrial Relations site or in the source document, not recalled. Where a question has no settled answer we say so rather than inventing one.

Who wrote this

M Squared Safety Solutions, Inc. is a California occupational safety consultancy and training provider in San Clemente. This page was written by Matthew Horovitz, Competent Person and former OSHA 500 authorized construction outreach trainer, with 20 years in risk management. It is free to read and free to quote with attribution.

What we do about this. We write the plan language for the specific pack on your site, record the determination where the published sources conflict, and train the people who will be standing there. Call 949-954-6581 or book a call.

Related guides

Primary sources

This page describes what the standards say. It is not a safety program, and whether any procedure is right for a particular job site and a particular battery is a determination for that employer, its own competent person, the equipment manufacturer and the authority having jurisdiction.