Steam Workshop: http://steamcommunity.com/sharedfiles/filedetails/?id=10785
Nexus: http://www.skyrimnexus.com/downloads/file.php?id=5312
This plugin will fix soul gems such that, when they are filled with a correctly-sized soul (e.g. a common soul in a common gem, as opposed to a petty soul in a common gem), the charge will 'stick' from that point, so you can drop it on the ground, or put it in a container, and you don't have to worry about it losing its charge. The charged gems will also stack correctly in your inventory. You will notice the value of the gem has increased as well, to the same as a filled gem you find in the world - in effect what this mod does is to replace the gem with an instance of the filled gems you would find in loot or whatever, once it has been filled with the correct soul. It will do this regardless of how the soul got there, whether through the soul trap spell, a bound weapon with the soul stealer perk, or a weapon enchanted with soul trap.
This mod does not change the behavior of soul gems that are not 'fully filled'. If your gem has an entry in your inventory like 'Common Soul Gem (Petty)' or 'Greater Soul Gem (Lesser)' this mod Will Not Do Anything. At All. You will still lose the charge in that gem if you drop it on the ground, and you will still probably lose the charge if you place it in a container. If on the other hand your soul gem has an entry like 'Common Soul Gem (Common)' or 'Greater Soul Gem (Greater)' then you are good to go. The gem will not lose its charge.
In v2.0, additional functionality has been added which ensures that you will only trap souls into gems of *exactly* the right size. For example, if the only empty gems you possess are grand gems and you trap a creature with a common soul, when that creature dies the soul will escape rather than fill your grand gem with a common soul (wasting it, some would say). Same for, say, trying to trap a petty soul with only lesser gems available to it, etc. You will never "partially fill" a gem again. This also in effect fixes black soul gems and the black star so that they only trap the black souls of humans and elves, which is what the game lore says they should do. Finally, an exception to all this exists for Azura's Star, so you can continue to partially fill it and use it to charge weapons, etc.
Those familiar with Smart Souls will notice v2.0 does the same thing. The only differences are this does not require SKSE, and this does not make changes to the notifications you get when you trap a soul.
That's all 2.0 does that 1.0 doesn't, so if you want to use Smart Souls instead, or don't want the extended functionality, you can continue to use the old version.
