I'm glad that they produced an answer for Society play, but what is taking so long to come up with some concrete solution for the Core Rulebook?
This book was released in mid-August, and the discrepancy between battery prices and item prices was noted almost immediately.
Obviously, no GM is gonna let you buy a thing and sell the battery in the thing for more than the thing itself, but it's also a rules error that should be easy to fix. It's not going to have cascading effects across the entire game or require rebalancing of WBL, or CR, or a particular class.
The fact that the problem may not arise in actual play doesn't mean that it's not a weird, obvious discrepancy. I'm kind of disappointed that some errata hasn't already been issued (other than the SFS one).