Apple continuously improves its iPhone line and a lot of new features have been introduced with each new model that comes out in the market. Yet the battery life of the new iPhone devices remains the least priority in terms of advancements.

One of the most common complains of iPhone 6 and iPhone 6 Plus users is its very limited battery life, which cannot sustain the life of the handset especially if it is being used for multiple apps simultaneously. Good thing there are accessories that help provide more juice to Apple's flagship smartphone products.

There are several cases that help lengthen the battery life of iPhone 6 in the market today. These include:

Alpatronix BX140 battery case

Alpatronix battery case for iPhone 6 offers protection and added battery life for Apple smartphones without adding too much bulk. It comes with multiple interchangeable bumpers with three different colors to choose from, including gold, silver, and black. The 3100mAh-laden battery case is currently being sold in the market for only $47.95.

PowerSkin PoP'n 2

PowerSkin is known as one of the first smartphone accessory manufacturer that offers a battery case that has an integrated battery that can be used for charging while the user is out and about. It offers a 4,000mAh capacity. It is priced at $69.99.

Moko

With its slimmer body and curved edges with built in battery, Moko is one of the preferred iPhone 6 cases in the market that provides better protection. Apple users can purchase the Moko iPhone 6 battery case for only $34.99.

i-Blason Beetle Sport battery case

If iPhone users are looking for sturdier, more durable mobile phone cases, then i-Blason Beetle Sport is the right one for their devices. It also has multiple interchangeable bumpers as well as an optional belt clip. It can be purchased for just $79.99.