Real World Labs posted ZAGG ZAGGSparq 2.0 Portable Battery Review
A quote from the article:
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Granted the rather slow charge and recharge times of the latest ZAGGsparq 2.0 portable battery by ZAGG may fail to impress but its 6000mAh Lithium polymer battery, built-in power plug and current price tag are more than enough to turn the tables in its favor.
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