Exhibit 99.1

Exhibit 99.1 PRESS RELEASE, DATED AUGUST 8, 2012, OF ENERSYS REGARDING FINANCIAL RESULTS FOR THE FIRST QUARTER FISCAL 2013

EnerSys Reports First Quarter Fiscal 2013 Results

Reading, PA, USA, August 8, 2012 — EnerSys (NYSE: ENS) the global leader in stored energy solutions for industrial applications, announced today results for its first quarter of fiscal 2013, which ended on July 1, 2012.

Net earnings for the first quarter of fiscal 2013 were $45.8 million, or $0.95 per diluted share, including a charge of $0.3 million, net of tax, for restructuring plans and $0.1 million for fees related to acquisition activities. The net earnings of $0.95 per diluted share, compares to diluted net earnings per share of $0.66 for the first quarter of fiscal 2012, which included an unfavorable net of tax impact of $0.02 per share from a charge of $0.3 million for restructuring plans and $0.5 million for fees related to acquisition activities.

Excluding these highlighted items, adjusted net earnings per diluted share for the first quarter of fiscal 2013, on a non-GAAP basis was also $0.95, which exceeds the guidance of $0.88 to $0.92 per diluted share given by the Company on May 29, 2012. These earnings compare to the prior year first quarter adjusted net earnings of $0.68 per diluted share. Please refer to the section included herein under the heading “Reconciliation of Non-GAAP Financial Measures” for a discussion of the Company’s use of non-GAAP adjusted financial information.

Net sales for the first quarter of fiscal 2013 were a record $593.9 million, an increase of 4% from the prior year first quarter net sales of $569.2 million. The 4% increase was the result of a 7% increase in organic volume, 3% increase from acquisitions and a 6% decrease from foreign currency translation impact. Sequential quarterly sales increased modestly despite a currency headwind of 2% from the fourth quarter of fiscal 2012’s net sales of $592.8 million.

The Company’s operating results for its business segments for the first quarters of fiscal 2013 and 2012 are as follows:

“During our first quarter we achieved record sales and operating earnings and attained our gross profit percentage target of 25% for the first time in eight years,” stated John D. Craig, chairman, president and chief executive officer of EnerSys. “I am very pleased with our first quarter adjusted earnings of $0.95 per diluted share.”

Mr. Craig added, “Our second quarter guidance for non-GAAP adjusted net earnings per diluted share will be between $0.85 to $0.89, which excludes the expected charge of $0.04 from our ongoing restructuring programs and acquisition expenses. Historically, our second quarter is our least profitable quarter due to the impact of the vacation season in Europe and the Americas. However, if we achieve even the lower end of our EPS guidance of 85¢, we will attain a second quarter EPS record which would be 27¢, or 47%, higher than the previous second quarter record.”

Reconciliation of Non-GAAP Financial Measures

This press release contains financial information determined by methods other than in accordance with U.S. Generally Accepted Accounting Principles, “GAAP”. EnerSys’ management uses the non-GAAP measure “adjusted net earnings” in their analysis of the Company’s performance. This measure, as used by EnerSys in past quarters and years, adjusts net earnings determined in accordance with GAAP to reflect changes in financial results associated with the Company’s restructuring initiatives and other highlighted charges and income items. Management believes the presentation of this financial measure reflecting these non-GAAP adjustments provides important supplemental information in evaluating the operating results of the Company as distinct from results that include items that are not indicative of ongoing operating results; in particular, those charges that the Company incurs as a result of restructuring activities and those charges and credits that are not directly related to operating unit performance, such as fees and expenses related to acquisition activities. Because these charges are not incurred as a result of ongoing operations or are incurred as a result of a potential acquisition, they are not a helpful measure of the performance of our underlying business. This non-GAAP disclosure has limitations as an analytical tool, should not be viewed as a substitute for net earnings determined in accordance with GAAP, and should not be considered in isolation or as a substitute for analysis of the Company’s results as reported under GAAP, nor is it necessarily comparable to non-GAAP performance measures that may be presented by other companies. Management believes that this non-GAAP supplemental information will be helpful in understanding the Company’s ongoing operating results. This supplemental presentation should not be construed as an inference that the Company’s future results will be unaffected by similar adjustments to net earnings determined in accordance with GAAP.

Included below is a reconciliation of non-GAAP adjusted financial measures to reported amounts. Non-GAAP adjusted net earnings are calculated excluding restructuring and other highlighted charges and credits. The following tables provide additional information regarding certain non-GAAP measures:

Summary of Earnings (Unaudited)

(In millions, except share and per share data)

EnerSys will host a conference call to discuss the Company’s first quarter fiscal 2013 financial results and provide an overview of the business. The call will conclude with a question and answer session.

The call, scheduled for Thursday, August 9, 2012 at 9:00 a.m. Eastern Time, will be hosted by John D. Craig, Chairman, President & Chief Executive Officer, and Michael J. Schmidtlein, Senior Vice President Finance and Chief Financial Officer.

A live webcast of the conference call will be available on the Company’s website at http://www.enersys.com under the “Investor Relations” link. Presentation materials to be used in conjunction with the conference call will become available under the aforementioned link shortly following the issuance of this press release.

The conference call information is:

A replay of the conference call will be available from 12:00 p.m. on August 9, 2012 through midnight on September 7, 2012.

The replay information is:

For more information, contact Richard Zuidema, Executive Vice President, EnerSys, P.O. Box 14145, Reading, PA 19612-4145, USA. Tel: 800-538-3627; Web site: www.enersys.com.

EDITOR’S NOTE: EnerSys, the world leader in stored energy solutions for industrial applications, manufactures and distributes reserve power and motive power batteries, chargers, power equipment, and battery accessories to customers worldwide. Motive power batteries are utilized in electric fork trucks and other commercial electric powered vehicles. Reserve power batteries are used in the telecommunications and utility industries, uninterruptible power supplies, and numerous applications requiring standby power. The Company also provides aftermarket and customer support services to its customers from over 100 countries through its sales and manufacturing locations around the world under the direction of its Americas, Europe and Asia regional headquarters.

More information regarding EnerSys can be found at www.enersys.com.

Caution Concerning Forward-Looking Statements

This press release, and oral statements made regarding the subjects of this release, contains forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, or the Reform Act, which may include, but are not limited to, statements regarding EnerSys’ earnings estimates, plans, objectives, expectations and intentions and other statements contained in this press release that are not historical facts, including statements identified by words such as “believe,” “plan,” “seek,” “expect,” “intend,” “estimate,” “anticipate,” “will,” and similar expressions. All statements addressing operating performance, events, or developments that EnerSys expects or anticipates will occur in the future, including statements relating to sales growth, earnings or earnings per share growth, and market share, as well as statements expressing optimism or pessimism about future operating results, are forward-looking statements within the meaning of the Reform Act. The forward-looking statements are based on management’s current views and assumptions regarding future events and operating performance, and are inherently subject to significant business, economic, and competitive uncertainties and contingencies and changes in circumstances, many of which are beyond the Company’s control. The statements in this press release are made as of the date of this press release, even if subsequently made available by EnerSys on its website or otherwise.

EnerSys does not undertake any obligation to update or revise these statements to reflect events or circumstances occurring after the date of this press release.

Although EnerSys does not make forward-looking statements unless it believes it has a reasonable basis for doing so, EnerSys cannot guarantee their accuracy. The foregoing factors, among others, could cause actual results to differ materially from those described in these forward-looking statements. For a list of other factors which could affect EnerSys’ results, including earnings estimates, see EnerSys’ filings with the Securities and Exchange Commission, including “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations,” including “Forward-Looking Statements,” set forth in EnerSys’ Annual Report on Form 10-K for the fiscal year ended March 31, 2012. No undue reliance should be placed on any forward-looking statements.