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Sritpower, a leading domestic manufacturer of miniature steel-shell batteries, has successfully closed a $4.2 million Series B financing round.
The investment was led by Anhui Haiheng Fuhe Zhixin Equity Investment Fund Partnership (Limited Partnership) and will primarily be used to expand production lines for miniature steel-shell button batteries, invest in technology research and development, and support global market expansion.
The funding is expected to further strengthen Sritpower’s position in the smart wearable device battery sector.
Founded in 2020, Sritpower is the first domestic miniature battery company to break through the patent barriers set by Germany’s VARTA and Chongqing ZJ Electronics. Founder and CEO Zhang Fengxue brings over a decade of experience in the consumer electronics supply chain and has led multiple technology industrialization projects.
The company’s core team comprises global technical experts holding nearly a hundred patents in materials science, intelligent manufacturing, and related fields, enabling a full-chain innovation capability from research and development to mass production. The team has successfully addressed the swelling resistance challenge of steel-shell button batteries, offering safe, reliable solutions for demanding devices such as smart glasses, true wireless stereo (TWS), and open wireless stereo (OWS) earphones.
A standout product from Sritpower is its independently developed “two-piece” wound button battery, which features same-side electrodes and uses the shell as the negative electrode. The design achieves zero electromagnetic interference, high space utilization, and permanent sealing, increasing energy density by over 15% compared with traditional batteries.
This technical approach differs significantly from VARTA’s “three-piece” wound button batteries, offering advantages such as low internal resistance, excellent rate performance, and strong shape adaptability. Downstream customers using Sritpower’s two-piece batteries are protected under patent law, eliminating infringement risk.
Sritpower has already partnered with leading domestic and international smart device manufacturers, with mass production underway for products such as Honor TWS earphones, Mijia smart glasses, Cleer OWS earphones, and Yingmu smart glasses. The company has received growing attention and recognition in the miniature steel battery market.
The rising shipment volumes of smart earbuds, smart glasses, and smartwatches are driving strong demand for miniature coin cell batteries.
The global smart glasses market is projected to expand at a compound annual growth rate (CAGR) of 27.3% from 2025 to 2030, reaching $74.8 billion by 2030. Alongside this growth, the miniature battery market, a critical component for wearable devices, is expected to surpass $4.2 billion over the same period.
China is anticipated to dominate the sector, accounting for nearly 60% of the global market, according to Grand View Research.
In the smart earbuds sector, IDC reports that China shipped approximately 59.98 million Bluetooth earbuds in the first half of 2025, up 7.5% year-on-year. True wireless earbuds accounted for 38.31 million units, an 8% increase.
The domestic Bluetooth earbuds market is expected to surpass $21 billion in 2025, with TWS products accounting for over 60%, and the corresponding miniature battery market estimated at $1.12 billion.
In the smartwatch segment, global shipments reached 45.57 million units in Q1 2025, a 10.5% increase year-on-year, with 34.81 million smartwatches shipped globally, up 4.8%. China’s smartwatch market saw shipments of 11.4 million units, a 25.3% increase year-on-year. The global miniature battery market tied to smartwatches is expected to exceed $1.68 billion in 2025, with the Chinese market contributing about $560 million.
Following the Series B financing, Sritpower plans to accelerate three strategic initiatives. Technologically, the company will continue advancing steel-shell coin cell battery expertise, improving energy density and swelling resistance, while exploring AI integration and smart battery management to enhance product adaptability.
On the market side, Sritpower will deepen cooperation with leading smart device brands and expand global channels, targeting over 30% market share in the three main wearable sectors within three years.
On production, the company will expand automated lines to increase capacity, optimize costs, and meet surging demand, positioning itself as a leading supplier in the miniature coin cell battery industry.
