8506.30.10.00 - Having an external volume not exceeding 300 cm3

This HTS category, 8506.30.10.00, specifically classifies primary cells and primary batteries utilizing mercuric oxide that have an external volume not exceeding 300 cubic centimeters (cm³). This includes a range of compact, non-rechargeable batteries that rely on the chemical reaction between zinc and mercuric oxide to generate electricity. Examples often include button cells, small cylindrical cells, and other batteries designed for low-power, long-life applications such as watches, calculators, hearing aids, and small electronic devices where size and consistent voltage are critical.

Within the broader classification of mercuric oxide batteries, this subheading is distinguished from its sibling category, 8506.30.50.00 ("Other"). The key differentiating factor is the explicit volume limitation. While 8506.30.50.00 covers all other mercuric oxide batteries not meeting the 300 cm³ volume criterion, this subheading precisely targets the smaller form factors. Therefore, a battery made with mercuric oxide would be classified here if its external dimensions result in a volume of 300 cm³ or less, and under the sibling category if its volume exceeds this threshold.

As this is a leaf node in the HTS structure, there are no further subcategories. Classification within this subheading is primarily determined by the presence of mercuric oxide as the active material and the measured external volume of the battery. Importers and exporters should ensure accurate measurement of the battery's volume to correctly apply this classification.