touch switch

Job ID: 32030146

Budget: $10 – $30 USD

It simply a touch switch .Using battery 3.7 volt , I need to touch the battery almunium cover it on and off the battery exactly the link I have mentioned below . I need only the circuit digram.

i need the circuit by smaller as possible , to not make a pcb larger than 4cm*2.5cm

https://youtu.be/h2UDisNECgw