Lithium battery Charger

Here's a very easy to do lithium betteries charger, which can be fixed just under youre desk for a very simple and efficient use.

You only have to buy the charging electronic cards and link them to the batteries.
I've bought these ones, very cheap and works perfectly :

https://www.banggood.com/5-Pcs-TP4056-Micro-USB-5V-1A-Lithium-Battery-Charging-Module-Board-TE585-Lipo-Charger-p-1255762.html?rmmds=myorder&cur_warehouse=CN

(only link "B+" and "B-" ports with the + and - of the battery