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The Astak Wall charger can put out a full 1 Amp of power.
This is twice the maximum a standard USB socket is allowed (Limited).
Add to that, some computers do not support ALL sockets IN USE at the rater 0.5 Amp at the same time.
Your Motorola charger may have a lessor rating than even 0.5A Output (Mine is 0.1A, non-USB)
The Initial 8-12 charge should be done with the Astak (or similar rated) charger (and only a single device attached, to get full power.)
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