Battery charger for Panasonic EY503 Screw Driver

This is USB charger for a Panasonic Screw Driver EY503 (or similar) battery, when it is converted from Ni-CD or Ni-MH 2.4V to lithium-ion 3.7V. Do not use to charge original 2.4V battery! Here is how to convert a battery for this tool. 

I have tried to put as much as possible of information into my pictures. 

Bill of materials: 

• micro USB (5V) charger board TP4056 to charge Li-ion battery of 3.7V, available on Aliexpress or Amazon.
• two bit of quite thin wire (AWG20-AWG24), red for ‘+’ and black for ‘-’ terminal. The carging current is 500mA max, so wire need not to be more than 0.5mm2. Length is aprox 25-30mm [1"]. 
• two bit of nickel strip of aprox. 0.25mm. Cut it in two strips: ~50x3mm for plus and minus terminal. 
• Three M3x10-12mm screws to assemble whole unit. 
• a bit of print filament ~5mm as a distance against the PCB. 
• Both enclosure details printed. 

Pull the nickel strip through both double pass holes. Provide that the strip's end does fit tightly forming a stable mechanical connection on its ends. Here will be corresponding wire tip soldered. Don't mix polarity: red=plus, black=minus. 

Solder both wire onto the PCB, than solder their ends on corresponding nickel strip contact terminals. Insert a bit of filament in the hole of upper part of the charger,  as a distance, first checking correct length. 

Assemble both parts with help of three M3 screws. 

Conncet a powered USB micro cable to the board's input. Check if it is correct voltage polarity on battery charging contacts (nickel strip). 

Finaly, insert a converted battery. Normally, the light from TP4056 board will be red indicating charging process, when a battery is inserted for charge. When the battery is fully charged, the light will turn to green. 

The project how to convert battery is here.