If you think you may short the connector when soldering it, please don't do it!
Soldering is a great skill to have in this hobby, but there are much less risky ways to get into it.
There is no shame in asking for help, if you are in a club (highly recommended) there is probably a helpfull clubmate that has the skills and equipment to do it safely and would be happy to help out a newbie by doing it for you (and after this covid crisis is over teach you how to do it yourself safely), or your local hobby store usually offer it as a service for free if you bought the boat and battery there, or for just a few bucks otherwise.
Any good charger will have a (often very slow) discharge mode, but if you discharge a 6s battery worthy of 8mm connectors down low enough to not vaporise a soldering iron tip shorting it out sending little blobs of molten metal flying around you, then you have severely overdischarged it, and may as well give it a week long salt bath and throw it away while it is discharged. Also I would say that it is probably safer to short a powerfull battery than a less powerfull one as one with power in will instantly melt/vaporise the short and as long as you are wearing eye-pro you would probably only have some minor burns to the hands arms and face, but if there isn't enough power to instantly melt the short there is a risk of arc welding the short into the circuit at which point you have an incendiary grenade on a short fuse in your hands (or at your feet as you dropped it, and it rolled under your bench, when it went pop). Personally when I work on LiPos I do it at normal storage charge.
Paul Upton-Taylor, Greased Weasel Racing.
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