Producer
FDK Corporation
Fujitsu-affiliated Japanese manufacturer, world's leading producer of consumer NiMH rechargeable batteries (AA/AAA) marketed under Fujitsu and eneloop brands. Acquired Sanyo Energy Twicell (former eneloop factory) from Panasonic in 2010. Operates the Takasaki Plant in Gunma, Japan.
2
Inputs supplied
1
Goods downstream
1
Facilities
0
Stories
What they make
2 inputs FDK Corporation supplies
Click an input to see every good that depends on it, every country that produces it, and every other company in the supply chain.
Where it shows up
Goods downstream
Essential goods that depend on something FDK Corporation makes — pick one to see the full supply chain.
What else they do
Business segments
The company's full revenue map — where this supply-chain role fits within their broader business.
NiMH Rechargeable Batteries (eneloop / Fujitsu)
60%Electronic Components (Ferrite + Inductors)
30%Lithium Batteries (Specialty)
10%
Intelligence
What's known
Sourced claims about this company's role in supply chains — chokepoints, concentration, incidents, dual-use connections.
Origin2024
FDK Corporation's Takasaki plant is the direct successor of the original Sanyo Energy Twicell factory that manufactured eneloop batteries — meaning FDK, a Fujitsu affiliate, is the actual manufacturer behind both the 'Fujitsu' and (historically) 'eneloop' brands of consumer NiMH batteries, even though Panasonic holds the eneloop trademark.
Wikipedia ↗Did you know2023
FDK Corporation produces both NiMH rechargeable batteries (eneloop-heritage, consumer AA/AAA) AND ferrite core and chip inductor electronic components — two seemingly unrelated product lines that share no obvious technology connection. The ferrite inductors in a smartphone power conversion circuit and the NiMH battery in a camera flash unit both flow from the same Fujitsu subsidiary. But more important is the supply chain vulnerability: FDK's NiMH battery production requires lanthanum/mischmetal for the negative electrode alloy (La-rich AB5 alloy at ~30% of electrode mass). This creates direct exposure to Chinese rare earth supply chains. China's April 2025 export controls on lanthanum (as part of the 7-element rare earth restriction) affect FDK's input costs and supply security for consumer NiMH batteries. NiMH batteries remain the dominant rechargeable chemistry in consumer AA format (cameras, high-drain remotes, medical devices) and in hybrid vehicle battery packs (Toyota Prius uses NiMH). FDK's lanthanum exposure connects Japanese consumer battery manufacturing directly to the same Chinese rare earth policy that disrupts EV motor magnet supply.
FDK Corporation ↗