Tool Batteries and Power Banks in the Job Trailer

Why tool batteries and not the forklift?

Because of the count and the conditions. A site might have one electric lift truck and two hundred tool packs, and the tool packs live in a steel trailer that reaches well above the temperature any manufacturer recommends, on multi-bay chargers that run overnight, with damaged packs kept in service because a new one costs money.

The chemistry does not care about the size. A cell in a tool pack fails the same way as a cell in a traction pack, vents the same family of gases and defeats the same extinguishers. What changes with size is the stored energy and whether a person can still carry the thing outside. For tool packs the answer is usually yes, which is exactly why the warning signs matter: they are the window in which a small problem stays small.

What does California actually publish about small batteries?

More than most people realize, and it is the most directly applicable guidance the state has issued. CAL FIRE, Office of the State Fire Marshal, Information Bulletin 26-007 of 28 August 2026 is written around home electronics and personal micro-mobility devices, which makes it a much better fit for a tool pack than for a forklift battery.

Its safety list, quoted:

  • "Always follow the manufacturer's instructions."
  • "Only use the battery that is designed for the device."
  • "Only use the original charging cord from the manufacturer with the device."
  • "Do not keep charging the device or device battery after it is fully charged."
  • "Plug directly into a wall electrical outlet for charging."
  • "Keep batteries at room temperature and away from heat or direct sunlight."
  • "Store batteries away from anything that can catch fire."
  • "Do not charge a device near your primary exit."

On temperature it gives numbers: do not charge them at temperatures "below 32°F (0°C) or above 105°F (40°C)." A closed job trailer in a Southern California summer passes 105 degrees before lunch. That single line is the most actionable thing in the bulletin for a contractor, and it is the one nobody is acting on.

What are the warning signs on a tool pack?

The same ones, which is the useful part. Bulletin 26-007 says to stop operating the device or charging the battery if it does any of the following: emits "an unusual smell," develops "heat," changes "shape/geometry," behaves "abnormally," or develops "a leak or make an odd noise." Its instruction is then unambiguous: "If any of the above happens and you feel in danger, call 9-1-1. If safe, move the device away from anything that can catch fire."

A swollen pack that no longer seats properly in the tool is a changed shape. A pack that gets hot sitting on the charger after the light goes green is developing heat. Crews notice both and keep using them, because nobody has told them those are the emergency rather than an annoyance.

What about disposal?

This is where contractors create a hazard out of an old one. Bulletin 26-007 is direct about it:

  • "Do not put lithium-ion batteries in the trash."
  • "Recycling is always the best option."
  • "Take them to a battery recycling location or contact your community for disposal instructions."
  • "Do not put discarded batteries in piles."

That last line is the one worth posting. The bucket of dead packs in the corner of the connex is a pile of damaged lithium-ion batteries in contact with each other, and a failure in one is in contact with the next. If you take one thing from this page, make it that bucket.

What belongs in the written program?

Short, and it attaches to documents you already have to maintain.

  1. Name tool batteries as a fire hazard in the fire prevention plan. 8 CCR 3221(b)(1) requires you to identify potential fire hazards and their proper handling and storage procedures. If your plan lists fuel and solvents and not the charging bench, it is incomplete.
  2. Set a charging location and keep it clear. Away from the exit, away from combustibles, not inside a closed trailer that bakes.
  3. Name who inspects packs and chargers, and when. 8 CCR 3221(b)(2) wants names or job titles for whoever maintains equipment installed to prevent or control fires.
  4. Write the damaged pack rule. Swollen, hot, damaged, odd smelling or making noise goes outside, away from anything combustible, and does not go back in service or in the bucket.
  5. Write the disposal route. Where they go, who takes them, how often.
  6. Put it in the toolbox talk rotation. Not once at orientation.

Do tool batteries need a safety data sheet too?

Under OSHA's stated position, yes. The article exemption several manufacturers claim does not hold up, and the California definition of an article is the cleanest way to see why. We work through that on the safety data sheet page.

How this page was verified

The CAL FIRE quotations were extracted page by page from Information Bulletin 26-007 itself on 11 September 2026 and checked back against that extraction string by string. Section 3221 was read on the Department of Industrial Relations site in the same pass. We deliberately do not quote any incident statistic on this page, because we have not recomputed one from a raw source.

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.