UL 2849: what e-bike battery certification means

What UL 2849 covers

According to the Standards Council of Canada's database and trade coverage of its publication, UL 2849 is the standard for "Electrical Systems for eBikes." The current listing is ANSI/CAN/UL 2849:2022A, and UL first published the standard in January 2020. Sources describe it this way:

• It covers the electrical system of e-bikes powered by a rechargeable lithium-based battery, pedal-assist and non-pedal-assist alike.
• The baseline system is the drive unit, battery, battery management system, interconnecting wiring and power inlet.
• Off-board chargers are in its scope.
• It does not cover the bike's mechanical structure, such as the frame or brakes.

Our summary rests on those listings, not on the standard's text, which UL sells. Read the standard itself for the exact requirements.

What certification does and doesn't tell you

CPSC staff, in a 2023 letter to standards bodies, advised consumers to use only e-mobility products certified by a third-party laboratory to the relevant standards, to use only chargers certified for the product, and never to use a battery pack modified or reworked by unqualified people or using repurposed or used cells. The same letter says compliance should be shown through certification from an accredited testing laboratory. CPSC has also drafted a proposed rule on lithium-ion batteries in micromobility products, so check cpsc.gov for its current status.

How to check a bike has UL 2849

1. Open the maker's product page and look at the specs or safety section. Some makers say "UL 2849 certified" there. Our own bike pages show a bike as certified only when the maker's page says so.
2. Read the manual. Look for UL 2849 and for the maker's rules on chargers and batteries.
3. Look at the battery and charger labels. Check for a laboratory mark and for your bike's model on the label, as your manual describes.
4. Ask the maker in writing if it isn't stated: which components are certified, by which laboratory, and whether the replacement battery and charger are covered.
5. Be careful with look-alike wording. "Meets UL standards" or "UL-certified cells" is not the same as an electrical system certified to UL 2849. If wording is vague, ask.

Short battery safety pointers

These come from CPSC's Micromobility Information Center and makers' manuals:

• Be present when charging.
• Use the charger provided with or recommended by the maker.
• Use only a replacement or secondary pack tested and approved to work safely with your device.
• Never use a pack modified or reworked by unqualified people.
• Do not put lithium batteries in the trash or general recycling.
• Report a battery problem on SaferProducts.gov.

For problems charging, see e-bike battery not charging.

Based on public listings, CPSC material and makers' pages, not laboratory testing.