Ask a sourcing team what the tariff rate is on a lithium-ion battery pack and you will get one number. That number is wrong. Not because the team is careless – because the question assumes a battery pack is one product. For tariff purposes, it is three.
The critical mineral inputs, the cells, and the battery management system (BMS) electronics each carry a different HTS code. Each has a different duty rate. Each has a different Section 301 status. Each follows a different country-of-origin determination. The effective tariff on the assembled pack is a composite of three separate profiles, and changing the origin of any one layer changes the composite.
I see this constantly in sourcing conversations. Someone quotes a rate on “batteries” as if it were a single classification. It is not. And the gap between the assumed single rate and the actual composite rate is where sourcing decisions go wrong.
Mineral layer
Battery-grade graphite, lithium compounds, cobalt chemicals, nickel sulfate, manganese – these are the raw material inputs that become anode and cathode materials. They classify under Chapters 25 through 28 of the HTSUS, depending on the specific mineral and its form.
Natural graphite classifies under HTS 2504.10. Lithium carbonate classifies under 2836.91. Cobalt oxides classify under 2822.00. These are not “battery” tariff codes. They are mineral and chemical tariff codes. The duty rates, trade program eligibility, and Section 301 exposure are completely different from anything in Chapter 85 where the finished battery sits.
Here is what matters: China controls roughly 70% of global graphite refining, over 60% of lithium chemical processing, and approximately 75% of cobalt chemical conversion. The minerals themselves are mined globally – Australia, Chile, the DRC, Indonesia – but the processing step that converts raw material into battery-grade chemical precursors is overwhelmingly Chinese.
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That processing step is where country of origin gets assigned. Australian lithium ore shipped to China for conversion into lithium carbonate becomes Chinese-origin lithium carbonate for tariff purposes. The mine location is irrelevant. The substantial transformation determines origin.
Section 301 tariffs on Chinese-origin minerals and chemicals vary by specific HTS code but the rates have been increasing. For sourcing teams, the question is not just “what does the mineral cost” but “what does the mineral cost after the duty rate assigned to the country where it was processed.”
Cell layer
Lithium-ion cells – whether cylindrical, prismatic, or pouch format – classify under HTS 8507.60. This is the battery chapter, and the rates here are different from the mineral layer entirely.
Section 301 tariffs on Chinese-origin lithium-ion cells were raised to 25% in 2024. That is on top of any applicable MFN rate. The same cells from Korea or Japan carry no Section 301 surcharge. From a pure duty perspective, a CATL cell from China and an LG cell from Korea are not even in the same cost conversation once the tariff stack is applied.
But the cell layer has a complication the mineral layer does not: the Inflation Reduction Act. IRA Section 30D ties the $7,500 consumer EV tax credit to battery component sourcing requirements. Cells manufactured or assembled by a Foreign Entity of Concern (FEOC) – which currently includes Chinese-owned or controlled entities – disqualify the vehicle from half that credit. The cell layer is not just a cost question. It is a qualification question.
Country of origin for the cell follows where the cell was manufactured. A cell using Chinese-origin cathode material but assembled in a Korean factory is Korean-origin for tariff purposes. But it may still trigger FEOC disqualification under IRA if the manufacturing entity is Chinese-owned. Tariff origin and IRA FEOC determination use different rules. A cell can qualify on one and fail on the other.
Electronics layer
The battery management system (BMS) is the control electronics that monitors cell voltage, manages thermal performance, and handles charge/discharge balancing. It is a printed circuit board assembly with processors, sensors, power management ICs, and connectors.
BMS controller boards classify under HTS 8537.10 (boards for electric control or distribution) or 8542 (electronic integrated circuits) depending on whether the unit is classified as a complete control board or as the IC-level components on it. The specific classification depends on the product’s form at import – a populated board classifies differently than the bare ICs that go on it.
This layer follows the same tariff structure as any other electronics assembly. Section 301 applies to Chinese-origin boards. Trade program eligibility (USMCA, KORUS) applies to qualifying origins. The rates and rules are the same ones that govern every other PCBA import.
The nuance is that sourcing teams thinking about “battery” tariffs often forget the BMS is an electronics import, not a battery import. It lives in the electronics tariff universe with its own classification logic. A BMS assembled in China using Taiwanese ICs is Chinese-origin for tariff purposes. Move the board assembly to Mexico with the same Taiwanese ICs and the tariff profile changes completely – USMCA eligibility, no Section 301, different cost structure.
What the composite looks like
Picture a battery pack for a commercial energy storage system (ESS). The sourcing team has proposed the following:
- Graphite from China (anode material, HTS 2504.10)
- Lithium carbonate from China (cathode precursor, HTS 2836.91)
- Cells manufactured in China (HTS 8507.60)
- BMS controller board assembled in China (HTS 8537.10)
Every layer carries Section 301 exposure. The mineral inputs carry their Chapter 25/28 rates plus the 301 surcharge. The cells carry up to 25% under 301. The BMS board carries the electronics 301 rate. The total duty exposure on the assembled pack is not one rate – it is the sum of three separate tariff profiles applied at three different points in the supply chain.
Now change one variable. Move cell manufacturing to Korea. The cell layer 301 surcharge drops to zero. The mineral layer does not change – the cathode still uses Chinese-processed lithium carbonate. The BMS does not change – it is still a Chinese-origin board. The composite rate drops, but only by the cell layer’s contribution.
Change a different variable. Move BMS assembly to Mexico under USMCA. That layer goes to zero. Cells and minerals are unchanged. Different composite.
The point is not that any specific combination is right or wrong. The point is that the sourcing decision requires decomposing the product into its tariff layers and analyzing each independently before the composite means anything. Optimizing at the pack level without understanding the layer structure is optimizing blind.
Where analysis breaks down
I talk to sourcing teams that run landed cost comparisons at the finished-goods level – “battery pack from Supplier A vs Supplier B.” The supplier quotes include the components and the margin. The duty rate applied is whatever the broker assessed on the last shipment of that SKU.
That assessment may be correct for the specific pack as imported. But it tells the sourcing team nothing about which layer is driving the duty cost, which layer can be changed independently, and what happens to the composite when one origin shifts.
This matters because the typical response to tariff pressure is “move to a different supplier.” But if the duty cost is driven primarily by the mineral layer, changing the cell supplier does not fix it. If the duty cost is driven by the BMS electronics, moving cell manufacturing offshore does not help either. The right response depends on which layer is the cost driver, and you cannot see that from a pack-level tariff number.
Why this matters now
IRA FEOC rules, Section 301 rate increases on Chinese-origin batteries, and escalating critical mineral thresholds are all hitting this vertical simultaneously. Each policy targets a different layer of the battery pack. FEOC targets the cell layer. Critical mineral thresholds target the mineral layer. Section 301 targets all three.
A sourcing team that treats the pack as one product will see ‘tariff costs are going up’ and look for a different pack supplier. A team that sees the three-layer structure will identify which layer is exposed, evaluate origin alternatives for that specific layer, and make a targeted change instead of a wholesale supplier switch.
Running your battery component HTS codes through an *EV battery and energy storage tariff analysis* shows the rate stack per code, per origin. The composite emerges from the components. It cannot be guessed from the top.
