Recently, outdoor energy storage, a branch of new energy storage, has suddenly exploded in the global market. According to public information, in the past 4 years, the size of the portable energy storage market has increased by 23 times. From the perspective of sales distribution, the US and Japanese markets account for more than 75%. Chinese companies have become the biggest beneficiaries of this wave of market boom. According to data, China's output of portable energy storage products accounted for 91.9% of the world's total in 2020. The portable energy storage market is growing rapidly. In addition to the increase in demand for outdoor products brought about by the unblocking of overseas markets, technological changes on the supply side are also factors that cannot be ignored. The development of the new energy automobile industry has greatly improved the energy storage efficiency of lithium batteries, but the cost has been rapidly reduced. The data shows that the average unit cost of lithium battery packs has fallen by nearly 80% over the past decade. Research institutions predict that the energy storage market will grow at a compound annual growth rate of 48% in the next five years and reach 80 billion yuan in 2026. Unicorns with annual sales of tens of billions will be born in China in the not-too-distant future.