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Dell Precision 3510 - turns off when unplugged

I have Dell Precision 3510 with Ubuntu, its relatively new, buy it in last august. Battery works fine before, but in one day it doesnt start without ac adapter plugged in and turns off if I unplugged.

I am not very experience linux user. I use this command  "upower -i /org/freedesktop/UPower/devices/battery_BAT0" to check the battery. It seems battery is ok. 

native-path: BAT0
vendor: LGC-LGC3.67
model: DELL G9G1H67
serial: 41793
power supply: yes
updated: Сб. 28 янв. 2017 00:24:55 (1065 seconds ago)
has history: yes
has statistics: yes
present: yes
rechargeable: yes
state: fully-charged
energy: 83,9952 Wh
energy-empty: 0 Wh
energy-full: 83,9952 Wh
energy-full-design: 83,9952 Wh
energy-rate: 0,0114 W
voltage: 13,011 V
percentage: 100%
capacity: 98,6428%
technology: lithium-ion

Wait for your advice

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