Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 46)

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In order to maintain battery performance, the following procedure should
be carried out every six months:
• Fully charge the battery
• Use on battery power until dead
• Recharge for 24 Hours
7.3. CD care.
You should note the following points when handling or cleaning your
CDs :
• Always handle media carefully and avoid touching CDs on the
underside.
• Always store CDs and cards in proper sleeves or containers.
• Never expose media to extreme heat, liquids, dirt or grit.
• Carefully wipe CD- discs with a clean, soft cotton cloth to remove
surface dirt like fingerprints.
• When cleaning CDs, use a straight-line motion, wiping from the
centre outwards. Never wipe the disc in a circular motion.