This is a top seller on Amazon, where it averages 4.5 stars. The 3,100 mAh battery can completely recharge the 4.7-inch iPhone 6 (and then some). Put another way, it delivers an extra 10-plus hours of web surfing. The protective design has a very slim profile and a hard-shell back with indicator lights to show how much power remains.
This product combines a regular skin for the 4.7-inch iPhone 6 and a separate 3,000 mAh battery, which attaches magnetically to the back of the case. Give the device a shake, and LED lights appear to indicate the power level. The case is a 4.4-star earner on Amazon and certified by Apple under the MFi Program.
Users of older iPhone models are in luck, because accessory prices are lower now that the iPhone 6 is circulating. This Apple-certified case fits the iPhone 5, 5S, and 5C. It has won 4 stars on Amazon and comes in a variety of colors. The 2,200 mAh battery offers a 100 percent recharge.
This MFi-certified case has accrued an impressive 4.3-star rating and more than 2,000 reviews on Amazon. With 2,400 mAh, it more than fully charges an iPhone 5 or 5S. The case is available in a range of color combinations.
This is one of a few well-regarded Android battery cases. It enjoys a 4.4-star rating on Amazon and offers more juice than most other cases -- enough to triple the battery life of the Galaxy S5. The battery and protective TPU cover add considerable bulk to the phone, reviewers note.