BUZZ-Ballard Power Systems Inc: Set for best day in 1-1/2 years
** Canadian fuel cell maker's U.S.-listed shares up 17.3 pct at $1.64
** Stock rises as much as 18.7 pct, biggest intraday percentage gain in nearly 1-1/2 years
** Company signs agreement to produce fuel cell stacks in China for use in buses and commercial vehicles
** Ballard Power will have 10 pct stake in joint venture with China-based partner
** Up to Friday's close, stock had fallen about 11 pct this year
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