I agree with you and I think another stock you guys should pick up is BLDP. Bought it at $2.40 (4,000 shares) now it's $4.22 within two weeks. Check it out, they also in the same sector as PLUG.
the reason you buy into Ballard is that they are the supplier of the PEM fuel cells to PLUG. I am not sure of any other reason for ballard to be up. FCEL is a different situation and rising on the back of power grid storage systems going into production in USA and Korea.
Ballard only rising on back of Plug power's business. So sensible supply chain trade (like buying Qualcom instead of apple.)