Product classification
HS code for Button cell battery: 8506.40
Cells and batteries, primary, silver oxide.
Classification of button cell battery under HS 8506.40
Button cell batteries utilizing silver oxide chemistry are classified under HS code 8506.40. This classification is based on the electrochemical system of the battery and its status as a primary (non-rechargeable) cell. Heading 8506 covers primary cells and primary batteries, and the subheadings are organized by the chemical composition of the cathode and electrolyte. Silver oxide batteries are characterized by their high energy density and stable discharge voltage, making them ideal for small electronic devices. The term "button cell" refers to the physical shape—small, cylindrical, and flat—but the HS code 8506.40 specifically targets the silver oxide chemistry. If the battery is a primary cell using silver oxide, it must be classified here regardless of its specific dimensions, provided it is not a secondary (rechargeable) battery.
- Covers
- Silver oxide button cells (SR series)
- SR44 and SR626SW watch batteries
- Primary silver-zinc button batteries
- Silver oxide cells for medical hearing aids
- Small silver oxide batteries for precision instruments
- Also under 8506.40
- Renata 377
- Sony SR626SW
- Maxell SR44
- Energizer 357/303
- Varta V371
Codes often confused with 8506.40
Common mistake. The most common misclassification occurs with HS code 8506.50, which covers lithium primary batteries. While both can be button-shaped, the chemistry is the deciding factor. Additionally, many users confuse these with HS code 8507.60 or 8507.80, which are for rechargeable (secondary) batteries. If a button cell is rechargeable (such as a lithium-ion LIR2032), it cannot be classified under 8506 and must move to 8507. Finally, manganese dioxide button cells are often incorrectly placed here instead of under 8506.10.
Top exporters and importers of HS 850640 (the code used for button cell battery), 2025
In 2025, the largest exporter of HS 850640 (the code used for button cell battery) in UN Comtrade data was Japan, with 43% of world exports; the largest importer in UN Comtrade data was the United States, with 24% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 850640, not only button cell battery.
Top exporters 2025 · share of world exports
- 1 Japan $134M 43% of world exports
- 2 Switzerland $57M 18% of world exports
- 3 Singapore $31M 9.9% of world exports
World total: $314M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $75M 24% of world imports
- 2 Hong Kong $45M 14% of world imports
- 3 Ireland $32M 10% of world imports
World total: $310M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for button cell battery
Brazil splits HS 8506.40 into 2 NCM codes. Pick the one that matches your product:
- 8506.40.10Silver oxide cells and batteries, up to 300 cm³
- 8506.40.90Silver oxide cells and batteries, over 300 cm³
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about button cell battery
What is the HS code for Button cell battery?
The HS code for Button cell battery is 850640 (Cells and batteries; primary, silver oxide).
How do I classify Button cell battery for customs?
Button cell battery is classified under HS code 850640 — Cells and batteries; primary, silver oxide. This is a 6-digit subheading level code.
What is the HS code for silver oxide button batteries?
The specific HS code for primary silver oxide cells and batteries is 8506.40.
Can rechargeable button cells use this HS code?
No, HS code 8506.40 is strictly for primary (non-rechargeable) cells. Rechargeable batteries are classified under heading 8507.
Which countries are the top exporters of button cell battery (HS 850640)?
In 2025, the top exporters of HS 850640 (the code used for button cell battery) in UN Comtrade data were Japan ($134M, 43% of world exports), Switzerland ($57M) and Singapore ($31M). World exports came to about $314M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of button cell battery (HS 850640)?
In 2025, the top importers of HS 850640 (the code used for button cell battery) in UN Comtrade data were the United States ($75M, 24% of world imports), Hong Kong ($45M) and Ireland ($32M). World imports came to about $310M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Button cell battery the same in all countries?
The base HS code 850640 for Button cell battery is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for button cell battery in Brazil?
Brazil splits HS 850640 into 2 NCM codes, so the right one for button cell battery depends on the product's details: 8506.40.10 (Silver oxide cells and batteries, up to 300 cm³), 8506.40.90 (Silver oxide cells and batteries, over 300 cm³).