It is a good idea to put the battery in something to hold it steady.
If you are not an expert solderer then you may want to practice soldering nickle strips together, before doing it on the battery.
Leave the PCB aside for now, with the soldering iron melt some solder on the + and - tabs, in the areas/sides that will connect to the "B+" and "B-" PCB pads ("Tin" the areas of the tabs to be soldered).
Leave the battery aside, inspect the PCB and clean any solder flecks or splashes away. Flow some solder on the "B+" and "B-" PCB pads.
Place the PCB on the battery top. Align the B+ pads to the plus tab and the B- pads to the minus tab.
Press the minus tab down on the PCB "B-" pads with the hot iron and when the solder melts then flow some more solder into the joint. Hold the tab in place with the tip of the tweezers or other tool and remove the iron. Let the solder joint cool without moving it.
Press the plus tab down on the PCB "B+" pads with the hot iron and flow some more solder into the joint. Hold the tab in place with the tip of the tweezers or other tool and remove the iron. Let the solder joint cool without moving it.
After the solder joints have cooled lay down one more layer of Kapton covering over the exposed PCB, exposed nickel and battery ends.
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