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1. Check to make sure that you have good air flow around the laptop, including sides and bottom.
2. Make sure fan/heatsink area is clear of dirt, etc. If you are using the laptop in an environment where there is a lot of dust, it will clog up the fan/heatsink.
Check the Lenovo support forum to see how the clogged heatsink looks. https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y560-overheating-and-shutting-down/m-p/677023
Be aware to get to access to the insides, will require dis-assembly of the laptop. Best left to experts.
The battery must have gone bad! if its three or more years old you need to get a new battery for the computer. Periodic conditioning of the battery from first use may prolong the battery life. Battery life is reduced by plugging computer with battery all the time.
Conditioning. Periodic full charge and full discharge practice is good for battery. Batteries are better charged when they are at less than 10% power and its better to charge them to 100%. Do not leave on electric power once they are fully charged.
I hope this helps in future but current battery may need replacement!
If your notebook unexpectedly goes into Sleep mode while you
are using it but the battery charge is not low, you may need to
recalibrate your battery. You should also recalibrate the battery
periodically to maintain the accuracy of the battery gauge.
Follow these steps to recalibrate the battery.
Connect your notebook to AC power and let the battery charge completely.
Disconnect the AC power and restart your notebook.
Completely discharge the battery.
After the battery is completely drained, reconnect your notebook to AC power.
Charge the battery completely until the battery status indicator turns blue.
Can u use your laptop with battery only? If not then try removing the battery and use the ac power only. If its ok then your battery need to be replaced. If not then i suggest replacing your ac power or both.
The cost to replace the cells is not economical as our company has looked into this. OVer time even a battery that has not been used that offten will stop holding a charge. Cost for a replacement battery online is about $125-$150. You maybe able to find one cheaper on ebay but be careful as some of them don't work for very long and have very limited warranty.