Nope, deans are extremely easy to install.
If you need a smaller connector the make gold plated bullet connectors that are even lower resistance than deans.
Be very careful discharging that battery as well. DO NOT drop the cells below 3v per cell. Contrary to the falsehoods being spread on several forums, it is possible for them to catch fire that way. I've seen it happen, in midair, and destroy a plane.
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