well i had bought one m-tec1230 rtc and came with a dead batery too what i did was put a batery socket like the ones in pc models and soldered this have an issue the board have many baterry holes for other type of batery´s you just have to unsolder one of them that is closed and the socket fits excellent i just had issues with the ram that didn´t let me close the trapdoor of amiga 1200 i tryed every thing i even cut the pins of the crystall an now i payed 22 euros for 2 ones in ebay and the solution was pretty easy just cut the inside rails of the trapdoor and the board can get even more inside finally i did it now i am just wondering if i can fit a 68882 50 mhz to overclock i just don´t know if it gets a xc or rc types
i wish i can help anyone with my explanation Greetings From Portugal