SITL: fix EvaluateBatteryModel example

Author: hunt0r

libraries/SITL/examples/EvaluateBatteryModel/EvaluateBatteryModel.cpp

@@ -62,15 +62,14 @@ void setup(void)
 
     // setup battery model
     battery.setup(amp_hour_capacity, resistance, max_voltage);
-    battery.init_voltage(max_voltage);
 
     uint64_t time = 0;
     hal.scheduler->stop_clock(time);
     const double time_step = 0.05;
 
     ::printf("time, voltage\n");
     while (battery.get_voltage() >= min_voltage) {
-        battery.set_current(current);
+        battery.consume_energy(current);
 
         ::printf("%0.2f, %0.2f\n", time * 1.0e-6, battery.get_voltage());