Product classification
HS code for Silver oxide battery: 8506.40
Cells and batteries, primary, silver oxide.
Classification of silver oxide battery under HS 8506.40
Silver oxide batteries are classified under HS code 8506.40 because they are primary (non-rechargeable) cells that utilize silver oxide as the positive electrode (cathode) and zinc as the negative electrode (anode) with an alkaline electrolyte. The Harmonized System organizes Chapter 85 to include electrical machinery and equipment, with heading 8506 specifically dedicated to primary cells and primary batteries. Subheading 8506.40 is reserved for those using silver oxide chemistry. These batteries are characterized by their high energy density and extremely stable discharge voltage, making them ideal for precision electronics. The classification is determined by the chemical composition of the active materials within the cell, regardless of the physical size or shape, although they are most commonly found in button or coin cell formats for small electronic devices.
- Covers
- Silver oxide button cells
- Silver oxide coin batteries
- SR-series batteries (e.g., SR44, SR626SW)
- Watch batteries using silver oxide chemistry
- Medical device batteries (primary silver oxide)
- Also under 8506.40
- Renata 377
- Sony SR626SW
- Maxell SR44
- Energizer 357/303
- Varta V371
Codes often confused with 8506.40
Common mistake. Silver oxide batteries are frequently confused with alkaline button cells (8506.10) or lithium button cells (8506.50). While they may look identical in size, the chemical system dictates the code. Additionally, they must not be confused with rechargeable silver-zinc batteries, which fall under 8507.80 as electric accumulators. It is critical to verify if the cell is primary (disposable) or secondary (rechargeable) before assigning the code.
Top exporters and importers of HS 850640 (the code used for silver oxide battery), 2025
In 2025, the largest exporter of HS 850640 (the code used for silver oxide 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 silver oxide 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 silver oxide 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 silver oxide battery
What is the HS code for Silver oxide battery?
The HS code for Silver oxide battery is 850640 (Cells and batteries; primary, silver oxide). The specific HS code for silver oxide primary cells and batteries is 8506.40.
How do I classify Silver oxide battery for customs?
Silver oxide battery is classified under HS code 850640 — Cells and batteries; primary, silver oxide. This is a 6-digit subheading level code.
Are silver oxide batteries considered hazardous for shipping?
While the HS code 8506.40 identifies the product type, shipping regulations often classify them under UN3090 or similar categories depending on their lithium content or other chemical risks, though silver oxide cells are generally more stable than lithium counterparts.
Which countries are the top exporters of silver oxide battery (HS 850640)?
In 2025, the top exporters of HS 850640 (the code used for silver oxide 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 silver oxide battery (HS 850640)?
In 2025, the top importers of HS 850640 (the code used for silver oxide 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 Silver oxide battery the same in all countries?
The base HS code 850640 for Silver oxide 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 silver oxide battery in Brazil?
Brazil splits HS 850640 into 2 NCM codes, so the right one for silver oxide 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).