Sony Corp. exhibited a cordless speaker system and mobile phone chargers powered by its direct methanol fuel cells (DMFC) at the International Hydrogen & Fuel Cell Expo (FC Expo 2009) taking place from Feb 25 to 27.

They all employed unique designs, containing fuel methanol in a see-through tank.

Sony used a Li-ion secondary battery to compensate for the low outputs of small DMFCs, allowing mobile devices to cope with steep current peaks.

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