Sharing my findings reading the manual for usage for the phone I bought TECNO W5 LITE.

Mobile phone battery is as far as every literate phone user is concerned the best thing that can make a user happy using his/her phone. Using a mobile phone whose battery is non-functional or weak is a horrible experience which every phone user hates very much, which in this case I have been a victim.

I consistently thought that licking the contact point of a phone battery is a very healthy way of knowing if your battery is still alive and kicking and also to test for the charge in it. This understanding is what I knew almost every phone technician thinks its good for phone batteries but on the contrary, I was amazed to find out just today as I bought a new phone, specifically Tecno W5 lite and I proceeded to read the guide inscribed into the phone so as to make a better user.

I was suprised to find out that the actions we take everyday (licking the point of contact) thinking its designated to detect the battery life was actually wrong. Licking the battery contact point causes short circuit, rusts battery and reduces the battery efficiency.