The Authority is consulting on the development of weight conversion factors to calculate the weight of rechargeable batteries.

These weight conversion factors can be used by rechargeable battery producers when meeting their reporting requirements under Ontario’s Batteries Regulation. All rechargeable battery producers will have the choice to report the weight of batteries they supplied into Ontario using the actual weight or using the weight conversion factors to do a unit-to-weight conversion.

Take Part in the Consultation

The Authority is holding a consultation webinar on June 2, 2020 at 9:00 a.m.
Register for the webinar

The one-hour session will include:

  • An overview of the consultation process
  • The methodology used to develop the draft weight conversion factors
  • A presentation of the draft weight conversion factors by battery size and application
  • Opportunity for participants to ask questions and provide feedback

The draft weight conversion factors, a recording of the webinar and the presentation slides will be posted here following the event. In addition to participating in the webinar, stakeholders can provide their feedback by email to
All feedback must be received by the Authority on or before June 23, 2020.

Process for Developing the Weight Conversion Factors

The Authority is working with a research team from the United Nations Institute for Training and Research to develop the draft weight conversion factors. The team has extensive experience in waste statistics, particularly around e-waste and e-waste components such as batteries.

The researchers carried out three steps to develop draft weight conversion factors:

1. Classification of all rechargeable batteries, including loose rechargeable batteries and replacement batteries for rechargeable batteries embedded within or sold with electronic products. Batteries were classified by chemistry, size, and application.

2. Development of weight conversion factors by size, using desktop research to compile a comprehensive list of average weights by battery size (including the casing/housing). For most battery chemistries, standard sizes and average weights from different data sources were found to be comparable and consistent.

3. Development of weight conversion factors by application, where the average weight of secondary batteries by application (g/unit) was obtained by dividing the average energy usage per application (Wh/unit) by the average energy flow per grams of battery (Wh/g). Calculated weight for battery casings were then added to the battery weight. The average weight by application were validated by comparing them to a sample of batteries in the marketplace.

The Authority will consider feedback received from stakeholders on the draft weight conversion factors developed by the research team before they are finalized. The final conversion factors will be included in the Authority’s Registry Procedure (Verification and Audit) for Batteries.

For more information about the Batteries Regulation under the Resource Recovery and Circular Economy Act, 2016, and the IPR framework and resource recovery requirements for batteries, visit the Batteries page on our website. Information about the wind up of Stewardship Ontario’s single-use battery recycling program is also available there.