Ummm sorry, but with PCs, holding the power button down does nothing with ATX form factor systems. This is because the power button is just a remote momentary switch to a momentary circuit on the motherboard that simply and momentarily connects the +5Vsb standby voltage to the power-on circuit to signal the system to power on (or off). There are no residual voltages in that circuit to bleed off.
It is critical however, to unplug from the wall (or, if equipped, set the power supply's master power switch to off) and to ALWAYS discharge any electrostatic build up "
in your body" before reaching into the innards of the computer. And the best way to do that is to touch bare metal of the case interior before reaching in. This will put you and the computer at "the same potential" - thus making it impossible for any further current to flow from your fingertips and through any ESD (electrostatic discharge) sensitive devices.
Note with the old "AT" standards, the front panel power button ran directly back to the power supply and for them, holding the button down did help bleed off residual voltages. But that was many years ago and no longer applicable. Old habits die hard.
Also note that while CR2032 is the most common designation and is used by the IEC (International Electrotechnical Commission), it is not a mandated industry standard designation. For example, the Duracell equivalent is DL2032 and the ANSI (American National Standards Institute) uses 5004LC for the same battery. As seen
here, there are nearly 2 dozen equivalent designations for the CR2032.
That said, as far as Speccy (one of my favorite programs), it is not uncommon for any of these hardware monitoring programs to show incorrect values - this seems especially true of voltages. Replacing the battery only costs a couple dollars so no big loss if Speccy was wrong. But for sure, before replacing something expensive, like a power supply, verify first by swapping in a known good supply, or having yours properly tested. Speccy, for example, shows my voltages as follows:
+3.3V Speccy shows 2.028 V
+5V Speccy shows 3.367 V
+12V Speccy shows 0.048 V
CMOS BATTERY Speccy shows 1.536 V
Cleary, if my voltages were really that far off, this computer would not be working.