Finally got the charging problem solved. No sure is it due to the latest firmware upgrade.  N2 took in only 200mA frombthe LG charger.
Off market USB cable is also not recognised well by the phone.  With original phone and Plantonics charger, im getting 1100mA of charging.
Thanks also to this great app that gives me visibility to the charging current – “Galaxy Charging Current”. Saves my day.