Patrick Frater Asia Bureau Chief“The Battle at Lake Changjin II” passed $500 million in total sales and remained unchallenged atop the mainland Chinese box office over the latest weekend.Data from consultancy Artisan Gateway showed no positional change among the top five films on a weekend that came a week after the Chinese New Year holiday wound down. Bona’s “Lake Changjin II” earned $43.5 million over the Friday to Sunday weekend, ahead of comedy “Too Cool to Kill” with $37.3 million over the same three days. In third place over the weekend was drama “Nice View” with $21.6 million and animation “Boonie Bears: Back to Earth” with $14.0 million.