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SparkFun Electronics will be closed on July 3rd, 2015 in observance of Independence Day. Any orders placed after 2:00pm MT on July 2nd will be shipped out after the weekend. Thanks!

Member #464391

Member Since: August 24, 2013

Country: United States

  • Never mind… Posted on wrong product.

  • Looking at the data sheet, anew things occur to me… 1. Max charge current is 100 mA on USB power and 280 mA on DC power supply even though common 18650 lithium ion batteries have a max charge current of about 500 mA. 2. Suppose charging a lithium cell yields a 20% efficiency loss, then a 3000 mAh capacity Samsung lithium battery will take 36 hours on USB power or 12.9 hours on DC power.
    Am I looking at this right?

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