TOKYO — Panasonic’s January-March losses ballooned 10-fold to $5 billion, completing a year of record red ink at the Japanese electronics maker battered by natural disasters and an ailing TV business.

The Osaka-based maker of Viera TVs and Lumix digital cameras reported today a record loss of $9.6 billion, among the biggest in Japan’s manufacturing history.

That comes a day after Panasonic’s archrival Sony Corp. racked up a record annual loss of $5.7 billion in its fourth straight year of red ink.

Sony, which makes the Walkman portable audio player and PlayStation game machine, had a $3.2 billion loss January-March — its fifth straight quarterly net loss to round out a fiscal year that was the worst in its 66-year corporate history.

Both companies’ TV operations, centering around flat-panel sets, have been battered by a powerful Samsung Electronics Co. of South Korea and other Asian players.

A strong yen has also eroded the value of overseas earnings for the Japanese.

Like Sony, which is hoping for a turnaround under a new president, Kazuo Hirai, Panasonic has tapped Kazuhiro Tsuga as president. The appointments still need shareholder approval.

Panasonic is forecasting a return to profit for the fiscal year ending March 2013, at $625 million profit on $101 billion sales, up 3 percent.

Panasonic does not have the entertainment or gaming businesses of Sony. But it is struggling as it attempts to strengthen solar panel and battery operations, including auto batteries, to find new areas of growth.

In a strategy released today, Panasonic said it will focus on business customers, not just individual consumers. It will increasingly target global buyers such as refrigerators in China and TVs in India, it said.

The company booked $9.6 billion in restructuring expenses over the fiscal year ended March, to turn itself around, including cutting costs in TV operations.

Panasonic’s sales fell in every major region, including the U.S., Europe, Japan, China and the rest of Asia.

Quarterly sales slipped 8 percent to $23.5 billion. Annual sales plunged 10 percent to $98 billion.

“Business conditions deteriorated,” Panasonic said in a statement, listing as negatives the supply chain disruptions from the tsunami in northeastern Japan and the floods in Thailand.

It also blamed the European financial crisis for slowing demand and cited worries about a steady and cheap electricity supply as a concern.

The tsunami last year set off meltdowns at several reactors at a nuclear power plant and is putting the supply of cheap power at risk.