I really like this product. It's definitely nice to be able to charge 2 batteries plus a third in the Spark. I have it 4 because it seems to run out pretty quickly, but I can charge the device, charge 3 batteries from 10% to full and then charge enough to charge one battery to full and the other to about 50%. I would give 5 stars if I could fully charge 6 batteries twice. I also bought a case that I wrote a review on. The suitcase is great for travel, but its capacity is limited.
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