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mramos1 said:Do you want +18 to be plus and minus 18?
ClydeCrashKop said:A laptop battery is not just a battery. I did an autopsy on one and they have an elaborate circuit board wired or sensed in parallel and series.
Most laptop batteries supply 14.8 V (or less). So a swithcing regulator seems necessary to me.
If the battery really supplies +18 V but you need both the positive and the negative voltage, a switching regulator would be necessary again.