On June 21, the longest day of the year, people could use an extra charge in more ways than one. To solve that challenge, Panera Bread is giving guests the opportunity to win a “Charged Up Cup” – a vessel for Panera’s new Charged Lemonades that doubles as a portable phone charger.

Earlier this spring, Panera introduced Charged Lemonades, with plant-based caffeine for a burst of energy. Fueled by clean caffeine from guarana and green coffee extract, Charged Lemonades come in three flavor combinations: Strawberry Lemon Mint, Fuji Apple Cranberry and Mango Yuzu Citrus. A 20-fluid-ounce Charged Lemonade without ice has about the same amount of caffeine as a Panera 20-fluid-ounce hot dark roast coffee.

Panera has now unveiled a limited-time, corresponding cup that doubles as a phone charger to give customers the ultimate charge to help get through the “Summer Slump”. The 17-ounce cup features a removable base for your phone to rest on. Winners can take a break from the summer heat and sip on their Charged Lemonade while charging their phone on the go, no outlet needed.

Entries for the Panera Charged Up Cup will be open for guests nationwide starting on Wednesday, June 15, and winners in New York City, Chicago, Los Angeles and St. Louis will receive theirs via personal delivery on June 21, the longest day of the year. Visit Panera’s Charged Up website for complete details and to enter for a chance to win a Charged Up Cup for free; limited quantities available.

“We wanted to find the perfect way to give our customers an extra charge ahead of the longest day of the year,” says Drayton Martin, vice president of brand building for Panera Bread. “Our new Charged Lemonades have been a huge success for those looking for a clean caffeine alternative, and we are excited to offer customers a way to get the ultimate ‘charge’ both for their bodies and their phones.”