Personal Vape Battery Burns Are Recordable: What OSHA's January 2026 LOI Means for Your 300 Log

A maintenance tech walks back to his work cell after break, sits down to grab tools, and his thigh gets hot. The personal e-cigarette battery in his front pocket has shorted against his keys, entered thermal runaway, and is now venting 500-plus-degree gas through his jeans. The first-responder report shows second-degree burns and a trip to the urgent care clinic for treatment.

Your EHS manager asks the only question that matters next Tuesday: does this go on the OSHA 300?

For years, the answer depended on whose handbook you read. As of January 20, 2026, OSHA has resolved the question in a Letter of Interpretation: yes, that burn is generally work-related and recordable under 29 CFR 1904.5. The reasoning closes the exceptions most EHS managers were tempted to apply, and it sets the default position for every facility carrying out this analysis going forward.

⚡ TL;DR: OSHA’s January 20, 2026 Letter of Interpretation confirms that a burn injury from a personal rechargeable lithium-ion battery — including a vape battery an employee brought from home — is generally work-related under 29 CFR 1904.5 if it happens during assigned working hours in the work environment. None of the obvious 1904.5(b)(2) exceptions (personal-grooming, self-medication, personal-tasks-outside-working-hours, voluntary-wellness) apply to this fact pattern. If the injury meets the general recording criteria in 1904.7 — medical treatment beyond first aid, days away, restricted work, loss of consciousness — it goes on the OSHA 300. Per-violation recordkeeping penalty: $16,550 serious / $165,514 willful (2025).

What the LOI Actually Says

OSHA’s January 20, 2026 Letter of Interpretation addresses one specific question and answers it cleanly. The question was whether an injury from an employee’s personal e-cigarette battery — brought from home, carried with unprotected terminals in a pants pocket, shorted on coins or keys, igniting in the workplace — is recordable on the OSHA 300, 300A, and 301 forms.

The analysis starts at 29 CFR 1904.5(a): an injury or illness is work-related “if an event or exposure in the work environment caused or contributed to the resulting condition.” Work-relatedness is presumed for events that occur in the work environment unless one of the limited exceptions in 1904.5(b)(2) applies. OSHA walked through each potentially relevant exception and explained why each one fails for a vape-battery burn that happens during working hours in the work environment:

1904.5(b)(2)(v) — personal tasks outside assigned working hours. Does not apply. The employee is on the clock.
1904.5(b)(2)(vi) — personal grooming, self-medication for non-work-related conditions, intentionally self-inflicted injuries. Does not apply. Carrying a battery for e-cigarette use is none of these.
1904.5(b)(2)(viii) — voluntary wellness program participation. Does not apply.

With every plausible exception closed, the 1904.5(a) presumption controls: the injury is work-related.

The Recording Decision Is a Two-Step

Work-relatedness under 1904.5 is the first step. The second step is whether the injury meets the general recording criteria in 1904.7 — death, days away from work, restricted work or job transfer, medical treatment beyond first aid, loss of consciousness, or a significant injury or illness diagnosed by a physician or other licensed health care professional.

For a thermal-runaway burn, the medical-treatment criterion is usually the trigger. The line between first aid and medical treatment is defined in 1904.7(b)(5)(ii). First-aid examples include cleaning, flushing, soaking; using non-prescription medication at non-prescription strength; using temporary immobilization devices on first aid; drilling a fingernail or draining a blister. Anything beyond that — prescription medication, sutures, professional debridement of burns beyond the most superficial — is medical treatment and triggers recordability.

For severe events, 1904.39 also requires reporting fatalities within 8 hours and in-patient hospitalizations, amputations, or losses of an eye within 24 hours. Thermal-runaway burns rarely cause amputations, but in-patient admission for treatment of a serious burn is in scope.

Why the LOI Matters Even Though the Rule Didn’t Change

Nothing in 29 CFR 1904 changed in January. The work-relatedness rule has read the same way since the 2002 recordkeeping rewrite. What changed is OSHA’s published position on a fact pattern that has become common — and that means the next inspection that runs across an unrecorded vape-battery burn has an LOI to anchor a citation.

Recordkeeping decisions you make this year live in the file for five years under 1904.33. The 300A you post next February covers calendar-year 2026 incidents — including any that happened before the LOI dropped. The defensible posture going forward is to apply the LOI to current-year decisions and review any unrecorded lithium-ion injuries from the current cycle.

The Scale of the Underlying Problem

The LOI lands against a backdrop of fast-growing lithium-ion incident data. A 2024 CPSC report tallied 586 injuries and 104 deaths in the U.S. from consumer lithium battery incidents. Global data compiled by UL through end-of-year 2024 shows roughly 15,949 incidents, 3,126 injuries, and 194 fatalities — the majority involving fires. EPA’s tracking of waste-facility battery fires found 245 fires across 64 facilities in 28 states between 2013 and 2020, a number that has grown sharply since.

In the workplace, the same physics is at play. When a lithium-ion cell enters thermal runaway, internal temperatures can exceed 500 °C (932 °F) and the cell vents flammable electrolyte gases. The associated injuries are thermal burns, chemical burns, eye injuries from venting gas, blunt-force injuries from rapid cell venting (essentially low-grade explosions in the case of a tightly enclosed device), and inhalation injuries. The vape-battery scenario is the most common; cordless tool batteries, e-bike batteries on loading docks, personal power banks at workstations, and employee-owned headphones are the next tier.

What to Do This Quarter

Apply the LOI to current-year decisions. Any lithium-ion injury in the work environment during working hours is presumptively recordable. Document the presumption and the 1904.7 analysis; if you exclude, document the specific exception under 1904.5(b)(2) that controls.
Review the current-cycle 300. If an in-workplace lithium-ion battery injury is in your records but not logged on the 300 because of a work-relatedness call your team made before January 20, revisit that call. Five-year retention under 1904.33 means the file will be visible to inspectors for years.
Update your 301 incident-report template. For lithium-ion events, capture: device type (vape, power bank, cordless tool, personal electronic), battery chemistry if known, whether terminals were exposed, carrying mode (loose in pocket vs. case), whether the device was on facility power at time of failure, and the post-event status of the cell (vented, ruptured, intact).
Add a four-bullet vape and personal battery rule to the site handbook. Most facilities prohibit vaping indoors but say nothing about spare batteries. The gap is the source of these incidents. Practical additions: no loose carry of spare batteries (require a case with terminal protection); no charging of personal devices on facility power without explicit approval; report any swollen, leaking, or damaged cell to a supervisor immediately; locker storage in non-combustible containers.
Train front-line supervisors on the LOI. When the maintenance tech with the pocket burn says “it was my vape, you don’t need to log it,” the front-line supervisor needs to know that the LOI says otherwise — and that the right move is to fill in the 301 and send the analysis up. Inconsistent supervisor responses are how injuries fall off the record.

The Broader Lesson: Lithium-Ion Recordkeeping Goes Beyond Vapes

The LOI focuses on personal e-cigarette batteries because that was the specific fact pattern in the inquiry. The underlying analysis under 1904.5 covers every personal lithium-ion device an employee may bring into the workplace. A facility seeing one vape-battery event has probably also seen a swollen laptop battery, a cordless drill battery that failed in a tool crib, or a power bank that vented at a workstation. Each one runs the same recordability analysis, and each one is presumptively work-related under 1904.5(a).

This is the kind of detail that gets missed when EHS scope is wider than the safety manager’s bandwidth — and where iSi’s industrial hygiene and EHS COOP work plugs in. We don’t replace your safety team; we handle the surrounding work that keeps the recordkeeping defensible, the written program updated, and the front-line supervisors briefed. If your last lithium-ion incident produced a confused call to OSHA or an HR debate about what to log, that is the gap we close. Reach out and we will walk the program together.