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NOKIA:
System.getProperty("com.nokia.mid.batterylevel");

SONYERICSSON (via Sensor API, starting from JP-8.3):

SensorInfo[] batteryInfo = SensorManager.findSensors("battery_charge", null);
SensorConnection sensor = (SensorConnection)Connector.open(batteryInfo[0].getUrl());
Data data[] = sensor.getData(1);
String batteryLevel = "Current charge level: "+data[0].getIntValues()[0];

(from http://developer.sonyericsson.com/community/docs/DOC-2956)

Labels: battery, j2me, java, nokia, sensor, sonyericsson