Help, everyone! I'm using m3 lite. How do i know if the internal battery died. Cant save games! (Both ds n gba games)

I would be castrated, beheaded and then hang on the door of LYN as warning for others for answering this but wth eh?. First.
M3 lite ORIGINAL dont need battery. It needs a memory card. If your M3 lite does not utilize a memory card. I am pretty sure you bought something that is anything but M3 lite

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The microSD is ok, even the previous saved games are still there. But now i cant save new games. Fake m3 lite? Oh noooo! (thought of giving up dsl already, since playing psp now). Sigh..

Think of switching to r4. Can i use r4 with a flashed dsl?