Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

[sureshbobby]

Lenovo u510 battery dead after full discharged
Its not waking up with charging showing that 4 min to full charge
Is there anyway to bring back to life
It is 11.1 li ion battery pack
No signs of voltge at battery
Is it possible to boost withdc power supply if possible please guide me
Thank you friends and techies

[piernov]

Re: Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

No, the battery's microcontroller probably entered permanent failure mode. You can't do anything about it, just buy another battery. You could still try to leave it charging for a few hours, but it will probably not charge.

[ktmmotocross]

Re: Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

or u can disassembly it and charge the cells

[piernov]

Re: Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

@ktmmotocross if it is in permanent failure mode, the fuse is blown and the controller is disabled. Charging the cells manually won't help and it can be dangerous if you don't know how to charge lithium cells.
You can however extract the cells and save them for another battery where the cells are worn out, if the cells themselves are still good.

[sureshbobby]

Re: Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

Hi Friends,
Thank you so much for your suggestions. By luck or what the battery is back to life again and acting as normal. i have run the gauge test in lenovo energy manager. after that its been starting working again. Hurray it saved me $40.

Thank you all

[sureshbobby]

Re: Lenovo ultrabook u510 li ion battery in sleep.mode how to wake up

Most probably li Ion battery will go to sleep mode because of fully discharge. i thought that it happens to my battery.