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Over the years this was called PRAM Parameter-RAM, newer models use the term NVRAM NonVolatile-RAM in either the coin battery is used to hold the settings. MacBook's & MacBook Pro's get a bit tricky! Apple started off with a (sometimes hidden) coin battery, they jumped to a clock chip (to hold some info) which had either a small battery or a super capacitor to hold its settings. Systems which have a removable battery all had a coin battery/super cap, the systems which have a serviceable battery (need to remove the bottom cover, battery screwed down or glued) started with the clock chip and then used a regular capacitor. The latest models use an EEROM so the settings are not held by battery at all now, only the clock used the capacitor to hold its settings when the main battery was removed. SMC reset sets a latch state so when the system is restarted the NVRAM is cleared. It doesn't discharge the capacitor! So some settings aren't cleared. To do that you need to disconnect the battery (and the charger) then press the power button holding it so the capacitor is allowed to discharge fully. Then reconnecting the charger (some systems will spontaneously restart, older 13/15" won't as the chargers are not quite powerful enough) using a 85W charger on a 13" will work! Otherwise you'll need the battery connected with some charge (using a REAL Apple charger some knockoffs might work). The voltage the Logic Board feeds to this super capacitor is 2,82 volts. I put a 47microFarad capacitor in its place and measured ca. 4 microAmperes flowing from the capacitor towards the logic board upon main battery and AC disconnection. (Just FYI: Me, trying to remove it I had the wider solder pad broken away from the PCB - no problem, it is just the common ground connection for the battery eeeeh capacitor - IF I decide to put another one back there, I'll just connect the (-) of the capacitor at another common ground point on the PCB - for the time being I'll stay capacitor less, since I never remove the main battery, and see how it goes.) Using this data, according to the Capacitor data sheet, if we say that the minimum holding voltage for the PRAM is 1.5Volts then the capacitor feeds the PRAM for more than 5 hours after main battery and AC disconnection if no power button is pressed - sorry, forgot to check/verify if the PRAM capacitor is depleted upon power button depressed while no main battery and AC connected. Oh, forgot to mention the capacitor must be the IV01E subtype (soldering tabs geometry differs per subtype).
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