** Shares of Jiangsu Zenergy Battery Technologies 3677.HK fall 9.3% to HK$10.81, their lowest level since September 10
** Stock on course for the biggest one-day pct decline since debut in Hong Kong on April 14
** China-based electric vehicle battery products producer plans sale of 45.92 mln new shares in share placement, raising HK$504.2 mln ($64.91 mln) to fund construction of new production facility, upgrade production line and for R&D
** Says the shares will be offered at HK$10.98 apiece, representing a 7.9% discount to Thursday's close of HK$11.92
** So far from its debut, stock up 30.7% from IPO price of HK$8.27 each
($1 = 7.7679 Hong Kong dollars)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))