Household alkaline batteries, which may include flashlight, watch, camera, AAA, AA, C, D, 9V Transistor, according to battery manufacturers, no longer (since approximately 1993) contain mercury and are no longer considered hazardous; therefore they can safely be disposed of in your household trash.
Rechargeable batteries, however, typically contain heavy metals that are
considered hazardous. Rechargeable batteries may be dropped off with
e-cycling at Department of Public Works, Services Division, 935 Spa
Road, Monday - Friday, 8 a.m. to 2 p.m. Please report to the office for
Self-balancing scooters batteries have been reported to catch fire,
therefore pose a risk if disposed of with your refuse. To properly
dispose of these devices the battery must be removed from the unit. The
image below shows the battery compartment on these units. After the
battery has been removed the unit may be disposed of with your refuse.
Contact your local battery retailer or electronic recycler for
information on acceptance of the battery pack.