Anyone opened up, and changed battery on Neo Geo Gold X handheld? Mine works when plugged in, but dosen't hold a charge and blinks red otherwise. Didn't seem to have much in the manual for replacing battery, but maybe I over looked it.

I tried charging it for hours with headphones plugged in which kept the background from running, but it didn't help.

Any how-to videos, or? What type of battery, or how many?

Thanks in advance.