Performance is always tricky to quantify ;-}
Adding more RAM doesn't always improve things. Sometimes its just a bit of cleanup that can make the difference!
One of the issues with SSD's is the garbage collection process and wear algorithms they employ. So if your SSD is on the small side and its quite full you can get into problems when the app is trying to re-cache the document (picture) as well as using virtual RAM. I recommend you leave 1/3 of the drive free for a 256 GB or smaller drive and for 512 GB and larger 1/4. I also encourage cleaning out the cache & log files out after you have done a large number of images to improve performance. Here's one tool that can help: Disk Doctor.
From a RAM perspective, monitoring what is in use, can help you gage if adding RAM is whats needed here. I like this app: Memory Clean2 it also allows you to flush out the stale RAM making more available.
As to your direct question on battery life penalty. Yes, adding RAM will add a bit of load to your system so if you just leave the system in sleep mode and disconnected the MagSafe power adapter it will run the battery down maybe 10 or so minutes sooner. In truth it's really not that bad!
If you are truly leveraging it it will be less load that trying to use your SSD for virtual RAM. So it's a bit of a wash here as in use it won't be a burden and it might give you a few minutes more (depending on what you are doing). Remember, the CPU & GPU will be the ones consuming most of the batteries power.
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