8

eMacs have a 3.6V PRAM battery and some sources indicate that when the voltage starts to drop that they may have trouble booting. Will an eMac work without a battery?

8

No. I measured the voltage across the power pins before and after installing a new battery and observed a change from 0V to 3.6V. The three pins for the power switch are 3.6V, ground and ground, with this potential difference coming from the PRAM battery. Without a battery installed (or with a battery that's severely depleted) closing the switch does nothing and the machine will not power on or show any signs of life.

| improve this answer | |
1

Yes, I pulled both dead pram batteries our of my emacs, they boot fine, just don’t keep settings when unplugged.

| improve this answer | |
  • 1
    Wonder if there's differences between models then. Will have to get the model code for mine – Matt Lacey Jan 19 at 5:48
0

I just started an eMac that has not run for 2 years. Even at that time the battery was kaput; it couldn't keep time and you had to set the time.

It started just fine for me, several times over and over.

However when I plugged in this eMac, the power strip happened to be in a location that is very dark. I could see a minor arc flash as the plug made contact. Something is powered up 24x7, and it has a capacitor!

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.