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Designer Tsung Chih-Hsien has created a Red Dot Design Award-winning concept for a tiny cardboard capsule that could juice up your phone. It's called the Mini Power. You just choose how much battery time you need—two, four, or six hours—plug it in, then recycle it later.

Tsung's biodegradable design, which he also envisions being purchased at convenience stores, eschews the plastic of most disposable batteries, which not only makes the case a little more environmentally friendly, but also saves on packaging. Since each Mini Power battery can just be broken off a perforated sheet, you could potentially buy them in bulk that way.