IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Hardware & Software Remarks
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S 4.115 Safeguarding the power supply of mobile
phones
Initiation responsibility: Administrators, users
Implementation responsibility: Administrators, users
Normally rechargeable batteries are used as a means of maintaining the power
supply to mobile phones. Depending on the capacity of the batteries and the
design of the mobile phone, a single battery will last for a limited time,
normally several hours. To ensure that a mobile phone is available at any time
in case of need and that no data held in temporary storage is lost, certain
precautions should be adhered to:
- Warning displays on the mobile phone that the battery is low should not be
ignored.
- If it is foreseeable that the phone will be used over a relatively long period,
then the battery charger should be taken along with the phone.
- When charging a mobile phone, the instructions contained in the manual
which comes with a mobile phone should be observed; in particular, care
must be taken to avoid impairing the life of the battery.
- Steps should be taken to ensure that when a mobile phone is issued, the
battery is in a charged state. The state of charge of the battery should be
regularly checked as a battery discharges over time even when it is not
being used.
It is also recommended that any data stored on the mobile phone, such as
telephone directory, short messages etc, is saved to a different medium at
regular intervals.
If it is foreseeable that prolonged use will be made of the mobile phone, e.g.
on business trips, a charged spare battery should be taken along as well. The
spare battery should be kept in a protective case as damage can occur through
overheating or fire if the battery contacts come into contact with conductive
materials. This can be caused by many objects in everyday use such as keys or
chains.
To avoid damage to the memory, a mobile phone should be switched off
before the batteries are changed.
A mobile phone should not be exposed to any extreme temperatures.
Otherwise, the battery in particular, but also the display, could suffer a loss of
functional performance. Therefore neither mobile phones nor batteries should
be left in parked vehicles.
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IT-Baseline Protection Manual: Oktober 2000
Check state of charge
regularly
Avoid short-circuiting
the battery
Danger of extreme
temperatures