The bottom exterior of the stainless-steel cups contains an accessible solder bead with levels of lead that exceed the federal lead content ban. Lead is toxic if ingested by young children and can cause adverse health effects. In addition, the lid can crack and break during use producing sharp edges and small parts, posing choking and laceration hazards to children.
The regulator/rectifier circuit board can fail and cause the engine to stall during riding due to an insufficient battery charge, increasing the risk of a crash.
