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9.3 Battery Capacity Display
The device monitors battery status in every operating mode. It is therefore possible to
display current battery status at any time. There are two options for displaying battery
status: display of battery voltage and display of available remaining battery capacity.
Battery voltage is an indirect measure of battery status. The end of discharge has been
defined as 4.0 V. The device turns itself off at a battery voltage of 4.0 V and can only be
turned on again when it has been connected to the power supply for recharging. With fully
charged batteries, the voltage may increase to 5.6 V, or even exceed 6 V during charging.
If you require information about the batteries, you can display all the important data in the
Info menu, submenu Battery Statistics.
The batteries' remaining capacity is displayed in percent. A fully charged battery has a
capacity of at least 99%. Determining the remaining capacity is a very complicated
calculation, in which the device observes battery status over an extended period and
collects these data as the basis for its calculation. An accurate calculation of capacity can
only be made following a complete recharge with ensuing complete discharge sequence. If
this has not yet occurred, as is usually the case with newly delivered devices, a question
mark will appear after the capacity display. The question mark thus indicates the
somewhat higher inaccuracy of the capacity display during its training period. This
obviously also means, that battery capacity has to be recalculated every time you remove
the batteries.
9.4 Automatic Recognition of Low Voltage
The Braille System includes battery voltage recognition in two steps. The first step turns on
an alarm signal every 18 seconds when the voltage falls to approximately less than 4.4 V.
This indicates that battery capacity is nearing its end, and that the batteries should be
recharged. You can turn the alarm signal off or on in Configuration Mode with [5].
When the lowest limit of battery voltage has been reached, at about 4 V, your Braille
System turns itself off. However, even in this state it uses up a small amount of electricity.
You should therefore never leave the Braille System in this state for longer than one day. It
would be best if you begin to recharge the batteries immediately, but you should at least
turn off the Braille System.
If you expect not to use your Braille System for several weeks, either recharge the
batteries first, or remove the batteries completely from the device.
9.5 Replacing the Batteries
The Braille System contains four rechargeable batteries, which enable you to work for
about 20 hours independent of a power source. For shipment, the battery compartment
contains an insulation sheet, which prevents discharge of the batteries. The batteries are
fully charged prior to shipment, so that you can begin working independent of any power
source as soon as you have removed the insulation sheet. The power supply included in
the package allows you to recharge the empty batteries.
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