I needed a new transmitter pack for my old JR X347. I went to Fry’s and got a pack of 8 2750mah NIMh cells to replace the old 600mah nicad pack. I don’t fly anymore, but these packs are for testing Victor motor controllers that I rebuild for the Combat Robotics crowd. In a couple of weeks Combots will be at the San Mateo Fair Grounds again!!

Here are the first 2 cells getting spot welded together. I had no fixture so I used this block and some scotch tape. I cut up some .010″ nickel strips to spot weld the pack together. The settings on the welder worked fine for this thickness of nickel.

Fold them in half.

Push them together.

Now I’m spot welding pairs of cells together.

I added the next pairs of cells to spot weld.

Here is the finished JR X347 pack.

I took the old JR X347 cells found the dead one, added a good one to them and made this my Futaba AM transmitter pack. Note that the settings on the spot welder are lower. These nickel tabs are recycled from the old Futaba pack.

Here is the new cell being charged by itself to bring it up to the same 100% state of charge that the other cells are at.