Users can use the following calculation to find out the approximate additional usage time from HyperJuice battery.
For example, the MacBook Pro 13" (mid 2010) which has a 63.5Wh rated internal battery which Apple claims can last for up to 10 hours.
With the HyperJuice 222Wh battery, the calculation will be 222Wh / 63.5Wh x 10 hours = 35 additional hours which gives a total usage time 45 hours (from using both internal and external battery).
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