# (b)(3)(i) — Lithium battery shipping limits (49 CFR 173.185)

For (b)(3)(i), applies to is lithium ion cell; threshold is 20 Wh; requirement is The Watt-hour (Wh) rating may not exceed 20 Wh, recorded from its source on 2026-08-03.

- **Provision:** (b)(3)(i) _(unconfirmed — we could not tie this to the quote below)_
- **Applies to:** lithium ion cell
- **Threshold:** 20 Wh
- **Requirement:** The Watt-hour (Wh) rating may not exceed 20 Wh

## What the source says

> ( i ) The Watt-hour (Wh) rating may not exceed 20 Wh for a lithium ion cell or 100 Wh for a lithium ion battery. After December 31, 2015, each lithium ion battery subject to this provision must be marked with the Watt-hour rating on the outside case.

## Source

- https://www.ecfr.gov/current/title-49/section-173.185

Last verified: 2026-08-03. Review by: 2027-01-30.
Part of [Lithium battery shipping limits (49 CFR 173.185)](https://referencesource.org/lithium-battery-shipping-limits/).