05-19-2015 12:48 PM
Whenever my Y40 is unplugged, the computer shows the battery to be at 100% and never decreases. A few minutes later the computer will turn itself off and won't turn back on. When I plug it back in and turn it on, it shows the battery is very low and charging normally, then shortly thereafter displays 100% fully charged (it's not). I've tried system restore and the following, which I've seen posted in several places:
"First of all, shut down the notebook, unplug the AC Adapter, remove the battery, and then hold down the Power button for 30 seconds.
Now, plug in the AC Adapter without the battery inserted, start the notebook, open windows Control Panel, open Device Manager, expand the entry for Batteries, right click on and the Microsoft ACPI Compliant Control Method Battery and select Uninstall - do not uninstall anything else here. When the uninstall is complete, shut the notebook down, unplug the AC Adapter, re-insert the battery and then start the notebook on just the battery. Windows will automatically reinstall the driver - leave Windows running for a few minutes and see if the charge level decreases as it should."
I don't know where to go from here. I bought the computer late last year and these issues suddenly started recently. I installed Start Is Back recently, but the system restore from beforehand didn't solve the issue. I'm running Windows 8.1 and everything seems to be up to date. Any advice?
Solved! Go to Solution.
05-19-2015 03:40 PM
Welcome to Lenovo Community Forums!
Can you try draining the Power in BIOS Menu. (In BIOS mode, Windows cannot control the power and the battery will be drained and reset its reading)
Unplug the AC adapter and turn off the computer
Now Turn it back on and start hitting F2, This will boot the computer in BIOS mode.
While in BIOS, Let the computer sit in this mode until it turn off by itself due to power loss of battery.
Now that the battery is drained.
Charge it back up till 100% and test it if it will be resolved
Hope this helps
05-20-2015 10:21 PM
Thank you very much for your advice. It half worked; the battery has, so far, lasted much longer, but it still displays 100%. It hasn't died yet, but I'm assuming it will die without warning once the battery's exhausted. Any more ideas?
10-11-2016 10:53 AM
In response to customer reports of unexpected battery gauge behavior on Y40-70 and Y40-80 laptops, Lenovo determined the battery gauge software is performing as expected. The unusual gauge results being reported are a reflection of the battery reaching end of life.
Lenovo has released a Service TIP to assist customers with obtaining battery replacements under warranty, or if out of warranty, to find a replacement battery from Lenovo-approved vendors. The Service TIP can be found here: https://support.lenovo.com/us/en/solutions/sf16-I0023
The part numbers for Y40-70/80 batteries are:
Y40 SP/A L13M4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500248
Y40 LG L13L4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500249 substitute part 121500251
Y40 CP/C L13C4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500259 substitute part 121500251
To determine which battery came with your Y40 notebook, instructions for removing the bottom cover can be found in the Hardware Maintenance Manual pdf here. An alternative to opening your system (which does not void warranty) is to search for batteries using the model/product number located on the bottom cover.
10-13-2016 08:38 AM
This doesn't make sense. How would this account for the variable length of my battery life? This has been a reoccuring issue with my computer, and one which Lenovo supposedly fixed before, but has repeated itself. It's turned my laptop into a desktop which has lost its usefulness.