The ones on the link look fine but you'd have the same problem if your struggling with soldering up the deans and you would have to cut the dean connector off the battery which would invalidate any warranty you have on it.
Personally I'd stick with the deans connector, file/scratch up the surface of the deans contacts, heat soldering iron, apply solder has it heats up to tin the iron, once heated apply heat to the connection then add solder.
like said before ensure you solder these the right way around and use heat shrink to ensure that the connections can not contact in the event it somehow comes off or becomes damaged.
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