Android crashes while using telnet command -

i new android. trying change battery level of emulator . saw following battery charging link

it opening telnet client , "open localhost 5554" working. power working , when trying execute "power status discharging" command emulator crashes close dialog shown below.

i found out answer question. in config.xml of android emulator hw.battery=no , should hw.battery=yes. problem why android emulator crashing.