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RE: LiFePo4 Battery from 13.2V to 12V (or 11.8V)

Hi,

What ohm (R) of the resistor depend on what mobo you're using and whether you're powering the P24 12V or P4 12V. For typical 500ma on P4 12V, a 2 ohm 5W resistor will do the job. Or you may plug the battery in directly to the P4 12V and leave it there. Yes, the P4 12V is shut off when the Mobo is powered off, hence no current running and no need for a switch for power on.


Or may be a good idea to use low dropout 3-terminal regulator to stabilize voltage at 11.5V(within 5% Tolerence of 12V).



Edits: 11/27/11

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