8507.30 - Nickel-cadmium storage batteries:

This HTS classification covers nickel-cadmium (Ni-Cd) storage batteries. These rechargeable batteries utilize nickel oxyhydroxide as the positive electrode and cadmium as the negative electrode, with an alkaline electrolyte, typically potassium hydroxide. They are known for their robustness, ability to deliver high discharge currents, and good performance at lower temperatures.

While the immediate sibling category 8507.20 also pertains to lead-acid batteries, and 8507.50 to nickel-metal hydride batteries, and 8507.60 to lithium-ion batteries, this category is specifically for the nickel-cadmium chemistry. It excludes other types of rechargeable batteries based on their distinct electrochemical properties and construction.

Within this category, the subcategories differentiate based on the battery's intended application. 8507.30.40 is specifically for Ni-Cd batteries used as the primary power source for certain electric vehicles, as defined by their respective subheadings. The more general category, 8507.30.80, encompasses all other nickel-cadmium storage batteries not falling under the specialized electric vehicle application.