Sourcing silver oxide button batteries from China

Duty on silver oxide button batteries

Heading 8506 covers primary cells and primary batteries. Silver oxide cells fall under 8506 40 00 00. The rows describe different purchasing formats within that same commodity line. For other chemistries, see the primary batteries and button cells guide.

Read from the UK Trade Tariff on 30 October 2026, silver oxide cells from China carry 4% duty. The supplied tariff record lists no anti-dumping or countervailing duty and no suspension for this line. It attaches an export control of mercury; ask your customs broker to confirm its relevance to the proposed shipment.

Confirm the chemistry from the factory datasheet and chemical test report before choosing the commodity code. A button shape alone does not identify silver oxide chemistry. For the landed-cost calculation, see UK import duty and VAT.

Specify chemistry, fit and discharge performance

State silver oxide chemistry explicitly and prohibit substitution with alkaline or lithium cells. Specify the cell designation, diameter, height, terminal arrangement and intended device. Agree capacity testing at the device's actual load, including the discharge endpoint and test temperature, rather than accepting an unexplained capacity claim.

Require batch identification, production-date decoding, agreed remaining shelf life and storage instructions. Obtain mercury and cadmium test reports for the supplied cell type. Confirm with the relevant authority which separate collection and chemical symbols the batteries need, and whether your business has battery producer duties for collection and treatment when placing batteries on the UK market.

Agree retail packaging that is hard for children to open, clear swallowing warnings and protection against loose cells contacting each other. Approve the pack artwork and opening method alongside the cell sample.

Worked duty example

Illustrative example, not a quote: Illustrative bulk order of 500,000 silver oxide button cells under 8506 40 00 00, invoiced at £50,000 free on board, with £3,000 of freight and insurance to the UK. The customs value is £53,000. Duty at 4% is £2,120. Import VAT at 20% is charged on the customs value plus duty, £55,120, so it is £11,024. Import taxes total £13,144; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £2,120 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity and fit: compare chemistry documents, cell markings, dimensions and polarity with the approved sample and intended battery compartment.

Performance: record open-circuit voltage and discharge-test batch samples under the agreed load; do not accept voltage alone as proof of capacity.

Condition: check seals, corrosion, staining and leakage, then retain batch samples for storage checks. Include these checks in the inspection brief.

Packaging and records: check child resistance, warnings, collection markings, batch traceability and that chemical reports identify the supplied cell type.

What goes wrong

A physically similar cell can have the wrong chemistry or discharge behaviour. Require the factory to identify the chemistry in the purchase specification and shipment documents. Compare delivered samples with the approved cell and investigate unexplained changes in weight, markings or performance.

Old stock, weak seals and overstated capacity can cause early failure or leakage. Packs can also leave loose cells accessible to children. Agree acceptance criteria before production, retain samples from each batch and resolve failed performance or packaging checks before releasing stock.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.