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This product is not an extra battery, rather it is upgrading your 500WH battery to a more power 650 WH battery.
The California Standard
Electric Bicycles are defined by the California Vehicle Code.New legislation became effective in January 2016. The current regulations define an “electric bicycle” as: a bicycle equipped with fully operable pedals and an electric motor of less than 750 watts, separated into three classes:
1. A "class 1 electric bicycle,” or “low-speed pedal-assisted electric bicycle,” is a bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour.
2. A "class 2 electric bicycle,” or “low-speed throttle-assisted electric bicycle,” is a bicycle equipped with a motor that may be used exclusively to propel the bicycle, and that is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour.
3. A "class 3 electric bicycle,” or “speed pedal-assisted electric bicycle,” is a bicycle equipped with a motor that provides assistance only when the rider is pedaling, (no throttle) and that ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour and equipped with a speedometer.
Local government ordinances are allowed to permit or ban any class of electric bicycles on dedicated bicycle paths and trails, with Class 1 & 2 permitted, and Class 3 banned, by default
All our bikes come as standard with a 28mph motor limit making them Class 3. Adding a throttle to the standard bikes will make them illegal for public use in every state. We can configure bikes to comply with class 1, 2 or 3 though. Please send us an email for more details.
Laws vary in different states / countries. Please check your local regulations. Here is a good resource of information in the US: http://peopleforbikes.org/our-work/e-bikes/policies-and-laws/