The Section 301 tariff on Chinese lithium-ion batteries did rise from 7.5% to 25% on January 1. That is not, however, the total duty a Chinese battery pack actually carries today. Stacked with a base tariff and a separate forced-labor tariff added in July, the effective rate on a non-EV Chinese lithium-ion pack stood at 40.9% as of late July, after spending part of the year even higher before a Supreme Court ruling struck down a different tariff layer entirely.
The tariff most commonly cited in coverage of the recent tightening around Chinese batteries, the Section 301 increase from 7.5% to 25% effective January 1, is real but incomplete. That rate applies on top of a 3.4% base duty under the harmonized tariff schedule, and since July 24, an additional 12.5% Section 301 tariff tied to forced-labor investigations covering 60 trading partners has stacked on top of both, bringing the effective total to 40.9% for a Chinese-made non-EV lithium-ion pack. Earlier in the year the rate was higher still, 48.4% in January, before the Supreme Court struck down a separate set of tariffs imposed under the International Emergency Economic Powers Act in February, temporarily bringing the effective rate down to 38.4% ahead of the July increase. Comparable cells sourced from Vietnam carry an effective rate of roughly 15.9%, cells from Malaysia or India about 13.4%, and a USMCA-qualifying pack from Mexico or Canada enters duty-free, a spread wide enough to make third-country sourcing, not just domestic manufacturing, a meaningful cost lever for developers trying to avoid the full weight of the China-specific rate.
The bulk power system executive order signed in August adds a different kind of restriction on top of that tariff stack, one based on national security risk rather than tariff schedules, and BloombergNEF’s Isshu Kikuma has pointed out what strict enforcement would actually mean in practice: because most currently installed US battery energy storage systems use Chinese cells, applying the order literally would mean removing the majority of the country’s existing grid-scale battery fleet. That is not a hypothetical drawn from a small or declining share of the market. GlobalData put the US and China’s combined share of global installed battery storage capacity at 74.6% by the end of 2025, and China alone installed 65 gigawatt-hours of battery capacity in December 2025, adding 18 gigawatts of capacity in that single month, compared with roughly 15 gigawatts the United States added across the entire prior year. China’s overall share of global battery supply sits around 80%, with an even higher concentration, roughly 85% of global manufacturing capacity, according to International Energy Agency figures, meaning the installed base the executive order’s plain text would technically reach is not a marginal segment of the US grid but close to its current operational core.
The timeline for the United States to no longer need that installed base is also less settled than a simple “capacity by 2030” framing suggests, because the industry conflates two different measures of self-sufficiency. Claims that the US has reached, or is close to reaching, 100% domestic supply typically describe finished battery pack and system assembly capacity, which the Solar Energy Industries Association put at 79 gigawatt-hours as of early 2026. The more consequential figure is upstream cell manufacturing capacity specifically, which SEIA separately measured at just 22 gigawatt-hours over the same period, and which Wood Mackenzie estimates could meet only 6% of domestic demand in 2025, rising to roughly 40% by 2030. A pack assembly plant that is 100% domestically sited can still be filling every one of its enclosures with imported Chinese cells, which is the specific configuration the new executive order and the Foreign Entity of Concern content rules are both designed to unwind. By Wood Mackenzie’s more granular estimate, meeting domestic cell demand without imports remains a 2030s-and-beyond proposition even under an optimistic build-out scenario, not something the current decade closes out on its own.
The retooling of former electric vehicle battery lines toward grid storage cells, which the source material describes as an ironic assist from a slowing EV market, is a documented and specific trend rather than a general observation. Ford ended its EV battery joint venture with SK On and is repurposing its Kentucky plant toward stationary LFP production, positioning the site as a dedicated storage hub and reportedly exploring licensed CATL technology in the process, an arrangement that would still route Chinese intellectual property into a nominally domestic facility. Samsung SDI’s own core EV battery business has weakened sharply enough, third quarter 2025 revenue down 22.5% year over year with both operating income and EBITDA turning negative, to give the company a clear financial incentive to convert its Stellantis joint venture capacity in Indiana toward energy storage cells rather than continue prioritizing an EV market that has not grown as fast as originally planned. That conversion wave is real and is adding US-based cell capacity faster than new-build projects alone would, but it is happening because EV demand disappointed, not because storage demand exceeded expectations, a distinction that matters for how durable the resulting capacity commitment is likely to be if EV demand eventually recovers and pulls some of that converted capacity back toward its original purpose.
