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What's DOS?
Posts: 1
Registered: ‎07-11-2017
Location: BR
Views: 133
Message 1 of 2

Lenovo z40 70 turns off immediatelly when unplug AC



This started about a few days, I have a Lenovo z40 70 with original parts (i7, 16GB, 1 Tb hd) and the computer identify there's a battery connected, but does not turn on with battery only and turns off when AC power cable is unplugged. I don't think the battery is dead since was lasting about 2~3 hours latelly. The notebook  seems even to charge the battery as usual.. but there's no condition to let it on without connecting AC...  Even before entering Windows the notebook refuses to use battery energy (immediatelly turns off) to boot on BIOS, for example. I dont know what's causing this. I recently have re-installed windows 10 on it... but the problems exists even before entering Windows... Any solution for that? I'm afraid of buying another battery without knowing if the battery is the problem.

Sr Support Specialist
Posts: 9,486
Registered: ‎11-30-2015
Location: PH
Views: 118
Message 2 of 2

Re: Lenovo z40 70 turns off immediatelly when unplug AC

Hi Luiz_Adolphs , 


Welcome to the Community Forums.


Checking on both battery and charging, you can refer to the "Power System Checkout" page 21-22 of the hardware manual. Having verified that the AC charger is working ok,  proceed with operational charging steps.


Unplug the charger and remove the battery. Place under normal room temperature as a hot battery may cause battery not to get charged then replace back when cooled. Assuming that the battery does not have more than 95% charge (battery naturally prevents charging beyond 95%), preferably less than 50% check the battery indicator status LED.


Simply plugging it in should at least show status and after 2-3 hours of being plugged in without powering on the laptop should at least change the status from amber to a blinking/solid white on the battery LED.




The best way to have it checked is having a spare battery if you have a local service center to verify the battery issue.


Hope this help answer your query.



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