What is this part on the iBook G4?

[pipetogrep]

Hi all,

I've disassembled a 1 GHz 12 Inch iBook G4 from 2004. I notice something that looks like a PRAM or CMOS battery. Can someone please tell me what this is and what the proper term for it is? If it is a battery, I'm having difficultly finding a replacement for it. It looks like its soldered on.

Thanks!

 

[Dronecatcher]

Hi all,

I've disassembled a 1 GHz 12 Inch iBook G4 from 2004. I notice something that looks like a PRAM or CMOS battery. Can someone please tell me what this is and what the proper term for it is? If it is a battery, I'm having difficultly finding a replacement for it. It looks like its soldered on.

Thanks!

I'd say that's a capacitor - likely similar to this:

KR-5R5V104-R | Digi-Key Electronics

Order today, ships today. KR-5R5V104-R – 100 mF (EDLC) Supercapacitor 5.5 V Axial, Can - Vertical 75Ohm @ 1kHz 1000 Hrs @ 70°C from Eaton - Electronics Division. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

www.digikey.co.uk

 

[samwa3]

PRAM capacitor: https://tinkerdifferent.com/threads...in-the-ibook-and-12-powerbook-g4-models.1880/

 

[pipetogrep]

Ah. So it's not a battery that will leak or anything. Thanks!

 

[samwa3]

Nope. It's a capacitor that will leak: https://68kmla.org/bb/index.php?threads/ibook-g3-pram-capacitor-schematic.41440/

 

[Intell]

Can verify they can and will leak, but not as bad as the lithium batteries from that era. I had one that started to leak in my iBook, clipped it out with some wire cutters.

 

[AphoticD]

@pipetogrep I’ve posted [partial] success on this “Super capacitor” repair here:

https://forums.macrumors.com/threads/my-powerbook-g4-12-journal-full-tear-down-ssd-upgrade-and-cpu-fan.2059980/post-26113641

And here:

https://forums.macrumors.com/threads/blueberry-ibook-clamshell-1st-gen.2087119/post-25618712

The trickiest part of this being it requires complete dismantling of the machine to pull out the logic board and desolder from the underside.

Good luck!

 

[eyoungren]

Can verify they can and will leak, but not as bad as the lithium batteries from that era. I had one that started to leak in my iBook, clipped it out with some wire cutters.

You will notice, nowhere did I mention anything about iBooks and PRAM batteries.

Touch a third rail once…

 

[Intell]

You will notice, nowhere did I mention anything about iBooks and PRAM batteries.

Touch a third rail once…

No cheese hat for you