* KOSPI falls, foreigners net sellers

* Korean won strengthens against dollar

* South Korea benchmark bond yield falls

SEOUL, Oct 24 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares dropped on Tuesday, hitting their lowest level in more than nine months, as battery makers slumped on a weakening demand outlook.

** The benchmark KOSPI was down 20.36 points, or 0.86%, at 2,336.66 as of 0207 GMT, after falling as much as 1.29% earlier in the session.

** The index fell for a fourth straight session and hit the lowest intraday level since Jan. 9.

** Dragging down the benchmark index, battery maker LG Energy Solution fell 1.95%, while peers Samsung SDI and SK Innovation lost 1.37% and 2.07%, respectively.

** "There is no good news around the battery sector, whose sales are slowing these days," said Na Jeong-hwan, an analyst at NH Investment Securities.

** Among other index heavyweights, chipmakers were mixed, automakers fell, but online platform firms and biopharmaceutical manufacturers gained.

** Of the total 929 traded issues, 156 shares advanced, while 725 declined.

** Foreigners were net sellers of shares worth 99.1 billion won ($73.68 million) on the main board so far on Tuesday.

** The won was quoted at 1,345.7 per dollar on the onshore settlement platform, 0.59% higher than its previous close at 1,353.7.

** In money and debt markets, December futures on three-year treasury bonds rose 0.13 points to 102.58.

** The most liquid three-year Korean treasury bond yield fell by 3.5 basis points to 4.019%, while the benchmark 10-year yield fell by 7.0 basis points to 4.296%. ($1 = 1,344.9200 won) (Reporting by Jihoon Lee and Youn Ah Moon; Editing by Janane Venkatraman)