NXC  Version 1.2.1 r5
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This is an example of how to use the BatteryLevel function.

// Display battery voltage for four seconds.
// This version does not use floats and will work on NXTs with firmware 1.07.
// Note: the BatteryLevel API call returns an unsigned integer giving the
// battery level in millivolts.
task main()
unsigned int millivolts = BatteryLevel();
unsigned int int_volts = millivolts / 1000;
millivolts %= 1000;
string left = FormatNum("Battery: %d", int_volts);
string right = FormatNum(".%03d", millivolts);
TextOut(0, LCD_LINE2, StrCat(left, right), true);