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) is adding phone chargers in some of its stores to encourage customers to order a drink and power up.
The coffee chain added Duracell Powermats to some stores in Boston last fall and has expanded the test to Silicon Valley, according to a Bloomberg report.
There will be about a dozen of the mats, which are supposed to be more energy-efficient than outlets, in select stores, Bloomberg wrote.
The test is expected to expand to stores across the country.
Starbucks eased 1.6% to $72.21 Monday, leaving the company with a market cap of $54 billion, based on 748.7 million shares outstanding. The 52-week range is $73.52 and $43.04.