I’ve learned over the years that there’s no such thing as an Apple accessory that’s perfect for every user. A design optimized for budget-conscious users will often turn off people who are ready to spend more for something fancier, and vice-versa. The best a company can do is to design, execute, and price products well for a particular segment of the population. Anker specializes in this — it focuses on creating very good to great accessories for value-focused users.

Its new Ultra Slim Battery Case for iPhone 6 ($40-$60 on Amazon) is another example of that formula. Unfancy but more polished than similarly budget-priced rivals such as uNu’s DX-6, it’s not the most powerful or beautiful iPhone 6 battery case I’ve tested, but it does precisely what most users want: it more than doubles the iPhone 6’s power, doesn’t add much bulk to the device, and costs very little relative to most battery cases. Anker’s regular $60 price tag would be competitive for an Apple-certified case on its own, but it frequently sells for only $40, the best overall value I’ve seen for iPhone 6 users, hands-down.

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