** Hong Kong shares of Ganfeng Lithium Group 1772.HK fall 5.8% to HK$29.18, on track for their biggest one-day pct drop since July 28

** Stock hits the lowest level since August 8; third-biggest pct loser on Hong Kong's material index .HSCIM

** Shenzhen-listed stock 002460.SZ slips 1.9% to 38.52 yuan

** Chinese lithium battery products producer plans to sell 40.03 mln H shares at HK$29.28 each, raising HK$1.17 bln ($149.78 mln); issue price represents a discount of 5.5% to Monday's close

** Also proposes to issue HK$1.37 bln ($175.39 mln) 1.5% convertible bonds due 2026

** Says bonds are convertible into 40.69 mln H shares at an initial conversion price of HK$33.67 apiece

** Proceeds will be used for repayment of loans, capacity expansion and construction, and for replenishment of working capital

** YTD, HK stock up 49.8%, Shenzhen shares up 11%

($1 = 7.8113 Hong Kong dollars)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))