Zinc Battery Demand by 2030: Why the 5-10% Claim Doesn’t Add Up

The figure gets repeated often: zinc-based batteries could take 5-10% of global zinc demand by 2030. Yet the only publicly accessible quantification from CRU, published in September 2024, points to a much smaller number. If zinc battery technology sits anywhere in your thinking about zinc miners, you may be carrying an inflated expectation.

The appeal is easy to see. Zinc consumption leans heavily on construction and galvanising (coating steel with zinc to stop rust), so a new battery outlet sounds like welcome diversification for a metal tied to building cycles.

The stakes cut both ways. Sized correctly, a battery market is a modest bonus worth tracking. Sized from an optimistic headline, it can pull capital into valuations and mine plans that the tonnages do not support.

Here is a realistic read on what zinc batteries could add to demand, which developers actually matter, and how to treat the exposure if you invest in zinc producers or run a zinc operation.

How zinc-air and zinc-ion batteries work, and why zinc suits long-duration storage

Two chemistries, one lithium-free premise

Zinc-air cells produce electricity by reacting zinc with oxygen pulled from the surrounding air. No lithium is involved. Zinc-ion cells use a water-based electrolyte (the liquid that carries charge between electrodes), which makes them safer than lithium-ion batteries.

Both chemistries are pitched on safety and longevity. Because many zinc systems use aqueous, non-flammable components, they can be sited closer to population centres or critical infrastructure. Proponents also point out that zinc costs less as an input than lithium and avoids reliance on cobalt from the Democratic Republic of Congo or on lithium brine sources.

The real argument, however, is about duration rather than replacing lithium.

The core cost argument Extending how long a zinc system discharges means adding more cheap zinc and electrolyte, not more expensive battery cells.

Flow-type zinc designs push this further by separating power (the size of the cell stack) from energy (the tank volume and amount of zinc). Utilities can size output and duration independently, which suits discharge periods of roughly 10-100+ hours. Engineering firm Burns & McDonnell has discussed flow batteries, including zinc-air, specifically in the context of long-duration energy storage.

Lower energy density rules out vehicles and most home systems. That leaves stationary grid storage and utility backup as the target markets, which tells you the demand opportunity depends on long-duration storage growing as a niche, not on batteries broadly.

The barriers that still hold the technology back

• Dendrites: needle-like zinc growths form during charging and can pierce separators, causing short circuits.
• Zinc-air rechargeability: repeated cycling degrades electrodes and erodes efficiency.
• Energy density: lower than lithium-ion, so systems need more space.
• Round-trip efficiency: less of the stored energy comes back out, raising cost per delivered kWh.
• System complexity: pumps, tanks and auxiliary equipment add maintenance.

These barriers sit at the root of commercialisation risk. When a developer makes performance claims, these five points are where you should test them.

Progress on rechargeable zinc batteries has been uneven, with dendrite control and cycle life still the gating items between laboratory results and bankable utility projects.

Who is building it: Eos, Zinc8 and Form Energy compared

Three names come up whenever zinc storage is discussed. They are at very different stages, and one of them is not a zinc company at all.

Eos Energy Enterprises (NASDAQ: EOSE), which uses a zinc-hybrid aqueous chemistry, offers the clearest commercial signal. Its Q2 2026 results, reported on 5 August 2026, showed revenue of $68.8 million, a commercial pipeline of $24.6 billion (about 112 GWh) and full-year revenue guidance tightened to $300-350 million.

Eos contracted backlog $807 million (3.4 GWh) at 30 June 2026, up 25% sequentially.

Zinc8 Energy Solutions tells the opposite story. It raised about US$15.5 million in early 2021 after signing with the New York Power Authority (NYPA) for a 100 kW/1 MWh peak-shaving system, following a 100 kW/1.5 MWh Brooklyn project costing about C$2.5 million with support from NYSERDA, New York’s state energy research agency. S&P Global reported plans for a roughly $68 million Kingston, New York facility.

Then the momentum stalled. The company became Abound Energy Inc., completed a reverse split and now trades at low volume amid financial challenges, with few project updates since 2023.

Form Energy is often cited as a zinc player, but the private company’s technology is iron-air. Its $750 million Series G in 2026 lifted total equity above $2 billion, and it reports a backlog of about 80 GWh. Its two 10 MW/1,000 MWh Xcel Energy projects at retiring coal sites remain subject to approvals or revised timelines.

Form Energy’s strategy rests on iron-air storage, which targets the same multi-day discharge window as zinc but uses an even more abundant input, so its funding success does not feed zinc demand.

Form’s funding success says something about appetite for non-lithium storage, but it does not translate into zinc tonnes. That leaves the zinc thesis resting heavily on one company converting its backlog into revenue.

Can zinc batteries really reach 5-10% of zinc demand by 2030?

The headline and the evidence diverge once you run the numbers. CRU’s September 2024 commentary lays out the logic in three steps:

1. Each 1 MWh of zinc-containing battery capacity uses about 2 tonnes of zinc.
2. The International Renewable Energy Agency (IRENA) forecasts global storage battery capacity of 422 GWh by 2030.
3. If zinc batteries took 5% of that capacity, they would consume about 45,000 tonnes a year; at 20%, about 180,000 tonnes.

The key detail is the denominator. CRU’s percentages describe zinc’s share of storage capacity, not its share of total zinc demand.

Global refined zinc demand runs at roughly 13-14 million tonnes a year. Set the CRU scenarios against that base and the picture changes.

Even the optimistic case, where zinc wins a fifth of global storage, lands near 1% of zinc demand.

On the accessible evidence, the 5-10% framing appears optimistic, and no public analyst projection supports it. CRU’s detailed forecasts are proprietary, so a fuller model may exist behind a paywall. Still, current battery-related zinc consumption is not reported in accessible sources, and no zinc-battery projections from Wood Mackenzie, Benchmark Mineral Intelligence or BloombergNEF were identified.

For context, LME zinc traded around $3,840 per tonne in early October 2026, with stocks near 127,000 tonnes. Price today reflects construction and galvanising, and battery tonnages at this scale would not change that dependence. Zinc batteries look like a meaningful incremental stream at best.

Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors.

What competes with zinc, and how should miners and investors position?

The case for non-lithium long-duration storage

The supporters’ argument starts with economics. CRU and Burns & McDonnell argue that lithium-ion struggles to compete beyond roughly 8-10 hours of discharge, leaving room for abundant, cheap materials such as zinc and iron in multi-day storage.

Serious money is testing that idea. Xcel Energy is exploring long-duration systems at retiring coal plants, and Form’s Series G shows institutional investors will fund non-lithium chemistries at scale.

The case for caution

Lithium iron phosphate (LFP) batteries, a lower-cost lithium chemistry, keep getting cheaper and increasingly target stationary storage. Sodium-ion and iron-air chase the same long-duration niche as zinc. S&P Global observes that zinc-air and iron-air remain limited to pilot and early commercial projects, while lithium-ion dominates installed grid storage and financiers tend to prefer proven technology.

The lithium storage cost curve is the moving target for every alternative chemistry, with LFP and sodium-ion pushing prices down just as zinc developers try to prove their own economics at scale.

Company failure is a real risk too. Storage start-ups need years of validation and heavy capital, and Zinc8’s restructuring shows how quickly a promising pilot story can fade.

The realistic framing Zinc batteries are a new, potentially meaningful but minority demand stream, contingent on technology, policy and financing.

For your positioning, that points to a low-cost watching brief rather than a change in exposure to zinc producers today. Miners can reasonably keep battery-grade zinc capability under review while anchoring mine planning on established demand. The signposts worth tracking:

• Eos converting its $807 million backlog into revenue
• Manufacturing yields at Eos and other zinc developers
• Regulatory approvals for long-duration projects such as Xcel’s
• Policy that rewards multi-day storage through capacity payments or market design

A long-dated option, not a demand shift: what to track from here

The technology is real, and Eos holds genuine contracts. The tonnage opportunity, though, measures in tens of thousands of tonnes against a base of more than 13 million, still dominated by construction and galvanising.

A zinc miner’s margin is shaped far more by ore grade and by-product credits than by any single end-market, which is why a battery stream of tens of thousands of tonnes would barely register in operating economics.

Three developments would justify revisiting that view: large-scale deployments proving cycle life, firm policy support for multi-day storage, and a rising zinc share of storage procurement. Until then, treat zinc batteries as optional upside. They should not drive your valuation of a zinc miner.

These statements are speculative and subject to change based on market developments and company performance.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions.