NEW DELHI: Facing wrath from customers over faulty batteries, Nokia on Thursday held Japanese battery maker Matsushita responsible for supplying the component and said it will take action after investigating the issue.

"We are investigating into it. But of course they are responsible to us," Nokia's worldwide CEO Olli-Pekka Kallasvuo said when asked whether Nokia was planning to pass on the cost of replaced batteries, estimated at 46 million globally, to the Japanese company.

The world's biggest mobile phone maker, which last week issued a product advisory for replacement of faulty batteries, has till date received about six million calls from Indian subscribers, of which about 4.6 per cent (over 300,000) cases qualified for replacement.

Kallasvuo, however, commended the pro-active intervention of the company in taking action and said: "Nokia as a brand has emerged even stronger."

The company did not divulge details about the financial cost for replacing batteries. It had issued a product advisory for the Nokia-branded BL-5C battery manufactured by Matsushita Battery Industrial Co between December 2005 and November 2006.

Asked whether Nokia would severe ties with Japanese firm, the Nokia chief refused to make any statement and said, "we are still investigating the matter."