Humanware Prodigi Duo User Manual page 44

IMPORTANT: The battery becomes warm during recharging.
Do not recharge the battery near a heat source.
To recharge the battery using mains electricity:
 Connect the USB Recharge Cable to the Tablet Power
Supply:
 Hold the Tablet so that the screen side is facing you and the
recharge port is aiming downwards. Make sure the tactile
HumanWare logo on the recharge cable is facing you (1).
Carefully connect the cable to the recharge port and plug it to
an outlet.
IMPORTANT: Use caution while inserting the cable into the
Recharge Port.
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