HS code · 6-digit subheading
HS Code 8506.40 – Cells and batteries; primary, silver oxide
HS code 8506.40 is the 6-digit subheading for cells and batteries, primary, silver oxide. It is used for SR44 silver oxide button cells, SR626SW watch batteries, 377 silver oxide batteries, hearing aid silver oxide batteries and calculator silver oxide batteries.
What HS 8506.40 covers
This HS code covers primary (non-rechargeable) cells and batteries that utilize silver oxide chemistry. These batteries are highly valued for their high energy density, stable voltage output, and long shelf life, making them ideal for compact, high-performance applications where reliability is paramount. They are predominantly found in watches, calculators, small medical devices, and hearing aids. The international trade in silver oxide batteries is driven by the demand for reliable, miniature power sources for precision electronics. Importers and exporters include specialized battery manufacturers, watchmakers, and medical device companies, all seeking high-quality, long-lasting power solutions for their compact products.
- Covers
- SR44 silver oxide button cells
- SR626SW watch batteries
- 377 silver oxide batteries
- Hearing aid silver oxide batteries
- Calculator silver oxide batteries
- Examples
- Renata 377
- Sony SR626SW
- Maxell SR44
- Energizer 357/303
- Varta V371
Codes often confused with 8506.40
Common mistake. Often confused with other primary button cells, especially 850610 (alkaline) or 850650 (lithium), due to similar appearance. The key is the silver oxide chemistry, which offers superior performance for specific applications compared to alkaline.
Top exporters and importers of HS code 850640, 2025
In 2025, the largest exporter of HS code 850640 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.
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 8506.40 2
Brazil splits HS 8506.40 into 2 NCM codes, Mercosur's 8-digit tariff lines.
- 8506.40.10 Silver oxide cells and batteries, up to 300 cm³Com volume exterior não superior a 300 cm³
- 8506.40.90 Silver oxide cells and batteries, over 300 cm³Outras
All Brazil NCM codes in heading 85.06 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8506.40
What is HS code 850640?
HS code 850640 is a 6-digit subheading in the Harmonized System that covers: Cells and batteries; primary, silver oxide. This HS code covers primary (non-rechargeable) cells and batteries that utilize silver oxide chemistry. These batteries are highly valued for their high energy density, stable voltage output, and long shelf life, making them ideal for compact, high-performance applications where reliability is paramount. They are predominantly found in watches, calculators, small medical devices, and hearing aids. The international trade in silver oxide batteries is driven by the demand for reliable, miniature power sources for precision electronics. Importers and exporters include specialized battery manufacturers, watchmakers, and medical device companies, all seeking high-quality, long-lasting power solutions for their compact products.
What products fall under HS code 850640?
SR44 silver oxide button cells, SR626SW watch batteries, 377 silver oxide batteries, hearing aid silver oxide batteries, calculator silver oxide batteries
What are common misclassifications for HS code 850640?
Often confused with other primary button cells, especially 850610 (alkaline) or 850650 (lithium), due to similar appearance. The key is the silver oxide chemistry, which offers superior performance for specific applications compared to alkaline.
Which countries are the top exporters of goods under HS code 850640?
In 2025, the top exporters of HS code 850640 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 goods under HS code 850640?
In 2025, the top importers of HS code 850640 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.
How is HS code 850640 structured?
HS code 850640 is a 6-digit subheading under the Harmonized System. The first 2 digits (85) identify the chapter, digits 3-4 (06) identify the heading, and digits 5-6 (40) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 850640?
Brazil splits HS code 850640 into 2 NCM codes: 8506.40.10 (Silver oxide cells and batteries, up to 300 cm³), 8506.40.90 (Silver oxide cells and batteries, over 300 cm³). The first 6 digits of each match the HS code.