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First post, by Bernkastel7734

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Hello,
so I got motherboard with old type barrel-type battery(Pic 1). Can I just solder it out and replace with a socket for 3V CR battery, or I need to find 3.6V new bartery. Does that .6V make a big difference ?

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Reply 1 of 8, by chrismeyer6

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You can replace it with a standard coin cell just be sure to use a diode to prevent the motherboard from trying to charge it. It looks like there maybe some corrosion as well so that needs to be addressed as well.

Reply 2 of 8, by dataino.it

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Solder a "CR2032 batty holder" to pin signed in photo

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Reply 3 of 8, by Bernkastel7734

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chrismeyer6 wrote on 2021-04-09, 12:28:

You can replace it with a standard coin cell just be sure to use a diode to prevent the motherboard from trying to charge it. It looks like there maybe some corrosion as well so that needs to be addressed as well.

Okay, does that matter if I connect the diode to positive or negative side of the battery socket?

Reply 5 of 8, by Bernkastel7734

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chrismeyer6 wrote on 2021-04-09, 12:28:

It looks like there maybe some corrosion as well so that needs to be addressed as well.

Soldered out old battery, there is no corrosion or leakage on the motherboard itself, just on the battery.

Reply 7 of 8, by majestyk

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It doesn´t matter if the diode is put in the positive or negative battery connector. The polarity must be correct.
And it´s a good idea to use a Germanium or Schottky diode, because they have far lower voltage drops of 0.2 - 0.4V as opposed to 0.7V of Silicon Diodes.

With a Schottky or Germanium (harder to find these days) type diode the voltage of the lithium cell is high enough for a longer time span so you save money.

Reply 8 of 8, by Bernkastel7734

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majestyk wrote on 2021-04-10, 06:18:

It doesn´t matter if the diode is put in the positive or negative battery connector. The polarity must be correct.
And it´s a good idea to use a Germanium or Schottky diode, because they have far lower voltage drops of 0.2 - 0.4V as opposed to 0.7V of Silicon Diodes.

With a Schottky or Germanium (harder to find these days) type diode the voltage of the lithium cell is high enough for a longer time span so you save money.

My Granddad has been working with electrical parts since 1950 so I have a lot of stuff in my garage. Used Schottky diode. Now motherboards holds bios setting. Thanks for help.