As one of its daily deals, Caloby offers the uNu ECOPAK Protective Snap-on Case and Detachable Extended Battery for Apple iPhone 5 in four colors for $24.99 with free shipping. That's $3 under our April mention (although that deal included a micro USB cable) and the lowest total price we could find now by $25. The 2,500mAh lithium polymer battery purports to double battery life. It also features an LED battery life indicator. Deal ends today.