Figure 5 Lifetime cycling characteristics using control method A and B CONCLUSIONS

A simple technique (weight measurement method) was studied for evaluating the behavior of phosphoric acid when a portable fuel cell is started up and operated. Use of this weight measurement method made it clear that an operation method that maintains the phosphoric acid's weight is effective. These studies resulted in prospects for attaining increased lifetime for portable fuel cells when used in a variety of conditions. SANYO will continue its pursuit of improved portable fuel cell reliability.

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