Charging base for Baofeng UV-82

This is a charging base that you will need if you want to connect your UV-82 radio battery to a smart battery charger, in order to have a better control over charging or to measure battery capacity.

It does not support balancing, since the battery casing does not have a balancing lead.

• Cut a 0.10-0.20mm battery nickel strip to 3mm width.
• Using small pliers roll, or bend slightly its both ends, so they can slip into the round cuts on the contacts.
  
• Leave in the middle about 3-5 mm where you will carefully solder the wires.
• Solder two short thin wires (cca 5 cm) directly to the nickel strip
• Solder the other end of each thin wire to two thicker wires. That is to allow the spring contacts to move more freely. 
• Insulate the connection between the thin and the thick wire with a heat-shrink  tube.
• Check the polarity of the battery contacts and solder the two thick wires to a Dean-T connector.
• The contacts are connected to the base with the bar that just clicks into the place. Do not glue any of it to the base, because it will make replacing the contacts if they break, much more difficult.
• VERIFY THAT THE POLARITY OF THE CONTACTS ARE PROPERLY ORIENTED!!!
• When removing supports, be careful not to break off the four tabs that hold the Contact Holder Bar!
  

Material

• PETG, ASA, or whatever works best for you. I used PETG as it provides just the right amount of flexibility for the contacts spring.

Additional Parts

• One battery nickel-strip 0.1-0.2mm thick, 3mm wide
• 4 small screws for plastic (3mm diameter)

Important Notes

• Do not charge or discharge with current higher than 0.5A
• Batteries have a protection circuit inside, that cuts off the battery when empty. That will make some smart chargers think that there is no battery connected. To mitigate that, just connect the battery to a standard charger for a second - that will open the protection circuit.