> << [snip] ... The PRAM battery in a powerbook is not only > for maintaing the contents of PRAM when the machine is shut down, but > also for maintaing the contents of RAM when the machine is in Sleep mode > and you are swapping out the main battery, with no power supply plugged > in. This takes a lot more juice than powering the PRAM only. >> > > Is that why my 520c no longer wakes up from sleep *even though* it's plugged= > =20 > into the AC all the while? I know the PRAM battery is dead/low, as I lose=20 > the date after leaving it unplugged for a day or two(with the main battery=20 > having just enough charge left =97 6.1v.=97 to keep the date for that short=20 > period). If it's plugged in, though, would the dead PRAM battery still=20 > cause it not to wake from sleep? > I would not think so but I sure don't know for certain. If there was a momentary interruption in the AC power whether in the power line or a poor connection in the computer's plug and jack, that could certainly cause Sleep to crash (with a bad PRAM battery). I do know that different results can be expected with different models of Macintosh with respect to a poor or completely bad PRAM battery. The old 512ke Mac could do without the battery just fine. It would only lose time, date and some Control Panel settings when Shut Down. But there are other desktop models that will exhibit various unacceptable behavior if the PRAM battery fails. I had a poor PRAM batt in a duo 250 that would keep time and date etc. (with power disconnected and main batt removed) but it would not allow the machine to Sleep for even one second (with power and main batt removed). In spite of this, the duo performed normally otherwise. It would allow Sleep with only the AC power adapter or only the main battery powering it. But maybe this is not true of the 520c. Greg ---------- Duo/2400 List, The friendliest place on the Net! A listserv for users and fans of Mac subportables. FAQ at <http://www.themacintoshguy.com/lists/DuoListFAQ.shtml> Be sure to visit Mac2400! <http://www.sineware.com/mac2400> To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> Need help from a real person? Try. <[EMAIL PROTECTED]> ---------- Dr. Bott | 10/100 Ethernet for your 2400 is finally here! MPC-100 | <http://www.drbott.com/prod/mpc100.html> NineWire | If they are cool enough to host this list... Digital Solutions | ...you should check them out! http://www.NineWire.com/ Midwest Mac Parts ][ <http://www.midwestmac.com> After-market parts for Macs. ][ 888-356-1104 ][ MacResQ Specials: LaCie SCSI CDR From $99! PowerBook 3400/200 Only $879! Norton AntiVirus 6 Only $19! We Stock PARTS! <http://www.macresq.com>
