🥜 Samsung SDI: Between Rebound Numbers and Questions to Verify - 2026.10.20

Hi, it’s Peanut 🥜 Let’s check the numbers together first, as always. Samsung SDI surged in a single day—but does the story really add up? I’ll go through the confirmed facts one by one.

The stock rose, but the numbers don’t quite match 📉

The market close report said Samsung SDI gained 11.70% ^[1]. Its trading value was 593,300,000,000 KRW, the highest among the top 50 stocks by percentage gain ^[2]. But according to the price data table, the stock’s change on October 19 was +11.51%, with a closing price of ₩591,000. That differs from the figure in the article, so it’s worth checking rather than glossing over. The next day, October 20, it opened at ₩587,000 and fell to close at ₩555,000,, down 6.25%. The sharp reversal in just one day makes it clear this is a volatile stock.

The three battery makers: fortunes diverge 🔋

With global EV demand slowing, the third-quarter results of Korea’s three battery makers are painting different pictures ^[3]. LG Energy Solution and Samsung SDI are mounting a rebound by building on the expansion of the energy storage system (ESS) market, while the article contrasted this trend with SK On’s weak performance. It’s an interesting picture of ESS opening another door as EVs lose momentum, but for now, that’s just the trend described in the article. The first question is how much of this ESS growth will show up in Samsung SDI’s earnings numbers.

Product diversification and next-generation competition: expectations vs. challenges

Samsung SDI is adding LFP batteries to its existing product lineup, which is centered on ternary batteries. It is also developing cylindrical LFP batteries for BBU applications. The strategy was described as broadening the range of products customers can choose from, rather than simply adding one material for a specific application ^[4]. Here’s the question that makes me pause: does a larger product lineup lead straight to orders? Can that be verified yet?

There’s plenty of talk about next-generation technology, too. Based on the headline, Samsung SDI and EcoPro BM are in pursuit in the 2027 all-solid-state battery race, aiming to stop Japanese companies from dominating ^[5]. We haven’t been able to verify the article’s full text, so let’s take this as a description of the competitive landscape only. The technology race is exciting, but whether expectations turn into actual mass production and contract figures is another matter.

The recycling dilemma—and Peanut’s question 💼

According to industry sources on the 19th, Samsung SDI is building a circular system to recover critical minerals from used batteries and put them back into production. The company is working through its recycling research lab to raise material recovery rates and develop environmentally friendly recovery technologies ^[6]. The article also pointed to the economics of recycling, as the volume of end-of-life LFP batteries grows rapidly. That’s exactly why the question arises: does taking them apart cost more than it’s worth?

When sentiment is bullish, it’s worth mapping out a bearish scenario, too. If the product lineup, all-solid-state batteries, and recycling remain just stories and profits don’t follow, that could become a value trap. Peanut thinks we should keep this possibility on the table, conditionally, until expectations show up in the numbers. So the biggest questions right now are whether ESS growth is confirmed in the third-quarter results, and when all-solid-state competition and recycling economics will become factors in earnings. Which numbers would you want to see first? 🤔

📰 Reference News (6)

2

Samsung SDI and POSCO Future M gain double digits… battery stocks rally

네이버뉴스 · 2026.10.19

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3

SK On tumbles, while LG Energy Solution and Samsung SDI…

네이버뉴스 · 2026.10.20

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4

"There’s no one right answer; tailor it to each application"… K-battery portfolios diversify

네이버뉴스 · 2026.10.20

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6

End-of-life LFP batteries are piling up fast… "Does taking them apart cost more than it’s worth?" The recycling dilemma

네이버뉴스 · 2026.10.20

📰 View original