Changing Battery Withings Nokia Body Cardio

My scale start to only maintain the charge from months to one week, its time to change de battery.

First of all start opening the scale with this manual:

https://es.ifixit.com/Desmontaje/Withings+Body+Cardio+Teardown/74987

Inside you can locate the battery, it is the same one that is used in the Samsung I9300 phones, you only need to buy a unit and solder two cables to positive and negative.

The polarity connections are marked on each battery.

That's all, charge and enjoy.