How to solve the battery mater problem for Y40-70/80?

Question:

 I've had my notebook for almost a year now and I just recently used express charging mode with OneKeyOptimizer and after that my battery meter is always wrong. It stays at 100% and drops to 0 quick. I have tried installing, and un-installing drivers (ACPI,Lenovo Power, etc.) and Disconnecting the battery from the motherboard. I also tried upgrading the BIOS and drivers, nothing. 

 Callibration using OneKey and Gauge reset using power manager and no luck either. I finally tried manually resetting the gauge (fully charging and discharging) and it now drops to 0 more slowly and stay on 0 for 4 or more hours. The battery life is very good (weird!).

 So I have three questions now:
1. Is there something I have not tried except re-installing windows?
2. Why did it happen when I only used express charging mode?
3. There is no OneKeyOptimizer or Power manager or any type of standard battery gauge software for lenovo y40-80 for windows 10, Is there going to be one soon? 

 Solution:

 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) 1003777
Y40 LG L13L4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 1003777
Y40 CP/C L13C4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 1003473

To determine which battery came with your Y40 notebook, instructions for removing the bottom cover can be found in the Hardware Maintenance Manual. 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.
If you are still don't know how to find the correct battery for your laptop, please take the picture of your old battery and send it to us, we will help you to find the correct one.

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