Upgrade via replacement.We wouldn't give you anything less than the best. Grade A cells chosen from among the top 10%. Rigorous inspection tests to ensure reliability. A built-in IC chip to prevent against short-circuiting. What does this all mean? In terms of quality, you won't find a better replacement. Don't just take our word for it, though - type in any quick, power-related search on Amazon and see who pops up. As the leader in our industry for the last 3 years running, we know batteries. Compatible Models:Samsung Attain 4G R920 / Samsung Rubby Smart I847 / Samsung Focus S I937 Get to know us.We're dedicated to making the smart life easier. As a Top Rated Brand on Amazon, we've established ourselves as a leader in the field, bringing innovative and reliable technological solutions to millions of users across the globe. Our Astro line of external batteries has been voted #1 in class by thousands of online reviewers and praised by tech bloggers, while our renowned customer service team has made us a fan-favorite across the web. With every sale, we include an 18-month, worry-free guarantee to demonstrate the importance we set on quality. After all, we're customers too.
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