Handy Tech
Elektronik GmbH
Active Braille
Battery Management
Page 96
10.3 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 4.3 V. The device turns itself off at a battery voltage of 4.3 V and can only be
turned on again when it has been connected to the power supply or USB 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 (see chapter 5.1.9.2).
10.4 Automatic Recognition of Low Voltage
The Active Braille includes battery voltage recognition in two steps. When the voltage falls
to approximately less than 4.6 V, a warning signal sounds every minute. This indicates that
battery capacity is nearing its end, and that the batteries should be recharged. You can
turn the warning signal off or on in the option menu (see chapter 5.1.10.12
).
When the lowest limit of battery voltage has been reached, at about 4.3 V, your Active
Braille turns itself off. However, even in this state it uses up a small amount of electricity.
You should therefore never leave the Active Braille 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 Active Braille.
If you expect not to use your Active Braille for several weeks, either recharge the batteries
first, or remove the batteries completely from the device.
10.5 Replacing the Batteries
The Active Braille contains four rechargeable batteries, which enable you to work for about
20 hours independent of a power source. The batteries are fully charged prior to shipment,
so that you can begin working independent of any power source. The power supply
included in the package allows you to recharge the empty batteries.
Due to aging of the batteries, or if you have been using non-rechargeable batteries, the
batteries must be replaced periodically. Please proceed as follows to replace the batteries:
1. Turn off the Active Braille and disconnect the power supply and USB cable.
2. If the Active Braille is inside of its carrying case, disconnect all cables connected to
the device and take it out of the case.
3. Turn the device over horizontally, so that the control keys are underneath.
4. The battery compartments on the bottom of the housing are secured by snap
catches, which should be pushed towards the batteries in order to open the cover.
Please note that the Active Braille features two compartments for 2 batteries each.
