Who taught you? This method simply won't work.
After rechargeable batteries fail, some can be repaired, but their performance has deteriorated and some cannot be repaired.
To repair a rechargeable battery, you need to use a special instrument called a “battery repair instrument”; there is also a more advanced charger that can also be repaired. This charger not only has charging function, also comes with battery repair function.
This method is useless. The correct method is: charge for half an hour, whether charged or not, unplug the charger, wait for a few minutes, then charge continuously for 12 hours. If the battery has the possibility of being repaired, it will be reactivated. If the battery is worn out, it will not work.