Hi, I got that old 486 motherboard, it seems working (at least it turns on) but I got a Low Battery error at launch. And actually there is no battery on the motherboard, and no place for an internal/soldered one. I assume I should plug an external one to it, but I'm unable to find where ! Most of the time there is a 4 pin connector, but I can't find one on that motherboard. At the bottom of the keyboard connector there is a J11 with 5 pins, there is 5V between pin 3 and 4. I suspect it could be that connector, I tried to plug a 3.6v battery on pin 3-4, and another try on pin 1-4, no results. Does someone have an idea ? Thanks.