Sony XPERIA Manual page 201

Internal Battery type is as follows.
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Symbol on Label
Li-ion00
Storing handset with full-charged or insufficient battery level deteriorates battery performance. It is
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recommended to store handset with 40% battery level.
Turning off by pressing Power Key does not shut off handset from power source completely.
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Unplug AC Charger power plug to completely turn it off. Use AC Charger (commercially available)
near a power outlet for easy unplugging in case that malfunction is detected.
Display may become dim when handset temperature rises. It is not abnormal.
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Do not subject handset to excessive shock. Do not deform External Device Port; may cause
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malfunction.
Occasionally clean Charging Terminals with a dry, cotton swab etc. Dirt on Charging Terminals
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may cause power shut-off or insufficient charging. Take care not to damage Charging Terminals
when cleaning.
Clean with a dry, soft cloth. Rubbing hard with a dry cloth etc. may scratch them. Wiping off with
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wet dustcloth may cause malfunction. Using benzine, thinner, alcohol, detergent, etc. may fade
color/print.
Do not leave Camera in direct sunlight. Concentrated sunlight through Lens may cause handset to
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malfunction.
Do not bring magnetic data or magnetic objects close to handset. Magnetic data on cash card,
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credit card, etc. may be erased or may cause handset malfunction.
Do not remove IMEI printed sticker or Nameplate.
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Use Attachment 52B for setting handset into Desktop Holder (optional accessory).
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Charging
AC Charger (commercially available) may become warm while charging. It is not abnormal.
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If charging is started, although handset is unavailable for operation, screen indicating that handset
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is charging appears. For this reason, do not charge where handset is required to be powered off.
Check battery level with Status Indicator at the top of screen.
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Operation time of Internal Battery varies by usage environment or the battery condition.
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Internal Battery is consumable item. Operation time per charge decreases by charging repeatedly.
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When operation time with full-charged is extremely shortened, it is time to replace. Internal Battery
is not customer-replaceable. Bring handset to a SoftBank Shop etc. to replace Internal Battery.
Fee is incurred for the replacement. Contact a SoftBank Shop or
Using application while charging may shorten Internal Battery life.
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xperia_15_Safety Precautions.docx
17
Battery Type
Lithium-ion
Customer Service.