Review of the Spire Power Bank 4000 Battery Charger. Spire recently introduced a new, and very slim Power Bank to their lineup, helping your mobile gadgets last just a little bit longer throughout the day. If you haven't guessed from the product title, the Spire Power Bank 4000 boasts a cool 4,000mAh Li-ion battery. Read on to see how we liked this unit and how well it performed.
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