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OG Xbox Forums => Hardware Forums => General Hardware/Technical Chat => Topic started by: solidus_snake on September 29, 2004, 01:19:00 AM

Title: Xbox Clock
Post by: solidus_snake on September 29, 2004, 01:19:00 AM

hi, i have an un modded xbox which i plan to mod in the near future, when i turn off the mains and leave it for a few hours and turn it on, i have to set the clock again, is this normal? or is there an internal battery i can replace?

Title: Xbox Clock
Post by: jack2004 on September 29, 2004, 01:22:00 AM

that's normal b/c xbox has no battery to keep the clock from resetting
you can only leave the xbox plugin to keep the clock setting

Title: Xbox Clock
Post by: EvilWays on September 29, 2004, 07:09:00 AM

He's right, there's no battery since an aerogel capacitor is used instead. If you are skilled with a soldering iron, you could replace the 1 farad capacitor at C7G10 or C7G3 (I believe it differs between mobo versions, but it's C7G10 on my v1.0 and C7G3 on my v1.3) for a 4.7 farad capacitor (that's the biggest one found that will physically still fit). You can find it at Digi-key (part # 283-2506-ND) or look for it at whatever electronic parts store/website (Cooper Bussman part # B0830-2R5475, make sure it says B-Series on it if you go this route). Once it's replaced, you'll hafta let it charge up for a while (it will take longer to charge than with the normal capacitor in), but it will last longer with the Xbox unplugged before you'd have to set the time again.

The datasheet for the Aerogel capacitors is here.

This post has been edited by EvilWays: Sep 29 2004, 02:15 PM

Title: Xbox Clock
Post by: jconstable007 on November 06, 2004, 09:39:00 PM

hmmm, I wonder if you could solder in a watch battery instead of the cap?  figure out the voltage and locate a lithum battery to replace the cap with, or locate a rechargeable battery small enough to go there.

Title: Xbox Clock
Post by: nightracer352 on November 08, 2004, 02:42:00 PM

would a pc 2 wire battery work?

(oh and can i have a like to that place your talkin about)

Title: Xbox Clock
Post by: thedustycelt on November 08, 2004, 02:48:00 PM

I have seen threads in the past where they have installed batteries in place of the cap. The problem though is that you have to limit the rate of charge, or you will fry the battery.  Some had success with resistors, while others created complete voltage regulator circuits.

Do a search in the forum, You might find some info in an old post...

Title: Xbox Clock
Post by: nightracer352 on November 08, 2004, 03:11:00 PM

QUOTE (EvilWays @ Sep 29 2004, 09:36 AM)

He's right, there's no battery since an aerogel capacitor is used instead. If you are skilled with a soldering iron, you could replace the 1 farad capacitor at C7G10 or C7G3 (I believe it differs between mobo versions, but it's C7G10 on my v1.0 and C7G3 on my v1.3) for a 4.7 farad capacitor (that's the biggest one found that will physically still fit). You can find it at Digi-key (part # 283-2506-ND) or look for it at whatever electronic parts store/website (Cooper Bussman part # B0830-2R5475, make sure it says B-Series on it if you go this route). Once it's replaced, you'll hafta let it charge up for a while (it will take longer to charge than with the normal capacitor in), but it will last longer with the Xbox unplugged before you'd have to set the time again. The datasheet for the Aerogel capacitors is here.

well then could you tell me what the hell this means cause thats why i asked

Title: Xbox Clock
Post by: thedustycelt on November 08, 2004, 03:22:00 PM

What evil ways said is quite clear and detailed. He is saying you can replace the smaller capacitor with a larger capacitor such as this one:
http://dkc3.digikey.com/PDF/T043/0820.pdf
A bigger capacitor will hold the clock memory longer...
You can buy one at:
http://www.digikey.com/


It will still only expand the clock memory from about 4 hours to ~ about one day.

Title: Xbox Clock
Post by: nightracer352 on November 08, 2004, 03:29:00 PM

so i have a 1.1 xb so could i still do this mod (or do i have the best whatever the hell its called) and how do i do it is it easy to do how long would it take me and would i lose my stuff that is saved on my box

Title: Xbox Clock
Post by: nightracer352 on November 08, 2004, 07:49:00 PM

SO? come on people

Title: Xbox Clock
Post by: nightracer352 on November 09, 2004, 01:17:00 PM

bump

Title: Xbox Clock
Post by: lunghd on November 24, 2007, 11:44:00 PM

Ancient topic & double post but brought it up as it might be what the next guy is looking for. (Know I was stumped until I found the answer...)

I just replaced the oem (fried) aerogel w/ a larger one from Allied Electronics who will sell you one individually and later send you a huge freakin' catalog FREE. I think the capacitor cost $9 & some change - it's not on my shipping invoice but reasonably sure that was the cost.

Allied Stock #:             651-0013
Manufacturer:              Powerstor (Cooper Elect Tech)
Manufacturer:              B1325-2R5106-R
Product Description:     Capacitor Supercapacitor
                                  Radial Lead 2.5V 13 x 25mm 10F


This one is both physically and 'electronically' larger than the crappy M$ one and if I understand correctly will keep a charge for a lot longer than the M$ installed aerogel cap did from the factory.

Because it is larger (ie: taller and larger in diameter) you must leave the leads full length and put heat shrink tubing on them. Be sure to note the orientation of your oem capacitor when removing as you'll need to put the new cap's + and - leads in the same holes.

A little careful use of a butane electronics soldering iron and a vacuum operated desoldering gun got one leg loose but the original had failed internally causing one leg to remain in the board. I got as much of the old solder off as possible & then used a straight pin chucked into a variable speed drill to bore through the solder still in the circuit board's holes. (Did this to also keep from cooking the traces though w/ a butane iron you should be ok.)

Installed new cap w/ insulated leads (full length!) and flipped board over & soldered w/ rosin core solder. Once set, flip the board back over & lean the taller capacitor over so that it's floating above the board and lower than nearby components.

Reassemble and enjoy having the freakin' clock keep time!  (IMG:style_emoticons/default/love.gif)

This post has been edited by lunghd: Nov 25 2007, 07:49 AM

Title: Xbox Clock
Post by: brittcrowell on February 03, 2020, 04:23:00 PM

I just had my xbox apart seeing if I could oil my noisy cooling fans and quite them down.
Then I noticed part of the MB had some sticky looking stuff on it.
On closer inspection the Aerogel had leaked on the MB and started corroding the MB.
Thanks to this post, I'll be ordering a new one from DigiKey.
It will be nice to get a new DigiKey Catalog for the ...eh em... library.  
Unfortunately DigiKey now (or might have always) charges a $5 handling fee for any orders for less than $25.

Again thanks for the answers in this post.