This is not new behavior:
https://www.mobileread.com/forums/sh...48&postcount=3
Also note that (before the 2E was released) I purchased two HDs hoping the batteries would be new. One was direct from Kobo. BOTH units, although new, were probably old inventory -- and the batteries acted just like my old ones. Both units were returned.
So don't count on getting an HD that will improve your situation unless the seller can prove they have installed a new battery in it.
I suggest you consider a new 2e.