Check this post, FIXED battery not charging/100% in app/solid charge light/dead when disconnected/parallel charging
Didn’t apply to my situation but worth a shot.
I adore TE design and the OP-Z and OP-1 are brilliant and unique instruments so I can’t say I wouldn’t get excited for an OP-2 or something but man…the hardware issues and lack of support in general combined with premium prices has been such a disappointment. Crazy to spend $600 on a portable synth that I can’t get error code explanations, public communication/problem acknowledgement, or even a simple new battery for.