nRF51822-mKIT power consumption about 18mA

Question

My Board PCA10024 (nRF51822 Chip QFAAG0) consumed at least 18mA with external 3V battery.
The nRF51822 chip itself consumed only 5uA in sleep mode.
What's go wrong? So a real test with coin-cell battery makes no sense.
See my question developer.mbed.org/.../ too. 
 Here is my test program 
 #include "mbed.h"
#define DEBUG(...) /* nothing */
// Test sleep mode for investigation power consumprtion
// PCA10024
// LED1 - short flash to show program start
// LED2 - should never on

DigitalOut myled1(LED1);
DigitalOut myled2(LED2);

int main()
{
 myled1 = 1;
 uint32_t i = 0x20FFFF;
 while(i--);
 {
 }
 myled1 = 0;
 NRF_UART0->POWER = 0;
 myled2 = 0;
 while(1) {
 __NOP();
 __SEV();
 __WFE();
 __WFE();
 myled2 = 1;
 }
}