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tmcintos/gist:365cc0a1f031aee333d02c1c18f24146

Created March 29, 2023 07:10
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SuperMicro P5STE CMOS/BIOS battery replacement with external battery connected via EXT BATTERY pin header
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gistfile1.txt
As described in <https://pcrebuilding.altervista.org/9/download/57a34d9c0195f_SUPERMICRO_P55T2S_jumper_settings.pdf>, the external battery header pinout is as follows:
JP30: Optional External battery, pin1: +3V, pin2 and pin3: No Connect, pin4: Ground
Note: pin3 (GND) is nearest the ATX power connector (top end of board in tower configuration).
I have had success removing the soldered battery and connectng a battery pack containing 2x AA batteries in series (+3V) to this connector.
Note that if 3x AA batteries are used (4.5V), the machine will not boot.
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