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SE PRAM Battery Location

raoulduke

Well-known member
I've been meaning to ask for a while. I inexpertly desoldered the old one years ago, thankfully without harming the board. Is it the two outer holes? The only image I found showed differently but I would like certainty if someone is sure of the answer?

Mouser sells these and I want to put a new one I got in.

 
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Elfen

Well-known member
what ever you get that can fit there, as long as it is 3 volts, it should be fine.

 

raoulduke

Well-known member
I gather my question wasn't clear.  I forget which of the four holes, two on each side, it was soldered to.  Based on the appearance, I assume the outer two holes.  Based on a picture I saw on google images searching for a guide-image, I am not certain.  Can anyone either snap a pic of their board or refer me to something that would definitively answer this question?

 

takimoto

Well-known member
From my SE mb,they are not outer pair.They are left pair(from back side of mb,scsi port upper)

IMG_0167 2.JPG

 

techknight

Well-known member
doesnt matter. they are electrically connected. 

The reason behind the two footprints is simple. One is for a battery holder, other is for a leaded-battery. 

 

raoulduke

Well-known member
takimoto - do you have an axial battery on the other side or a holder?  Techknight I'm not sure I follow - is that what you meant or are there just leaded and unleaded axials?  Or some third thing?

[And either way, in that style, like takimoto's, there's only one hole on the one side, so it's not exactly commensurate with this quesiton.  That's not a criticism, I mean you can just rule out screwing up on the side with one hole since there isn't a second option.  But the inner holes on my board also look a bit large to have been used for this - also clean.]

I think what generated this question was that I maybe I saw a board like takimoto's [it was a while ago and I can't find/recall the pic in question].  But clearly at least some boards use those outer two, and given the soldered state of mine I assume that's correct here also.

http://appletothecore.me/files/pasted-graphic-537macserestore.jpg

https://c1.staticflickr.com/3/2636/3862295969_4a6e6ecc59_b.jpg

https://upload.wikimedia.org/wikipedia/commons/6/65/Apple_Macintosh_SE_Main_PCB.jpg

http://www.ccadams.org/se/SE-800k-logic.jpg

 
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unity

Well-known member
Im confused by the confusion on this. The original SE models had wire-lead batteries. Then they moved onto holders. The SE was originally designed for both, something Apple does even with some capacitors (surface or through-wire). The move to holders came a little later. When exactly I can not say since there are so many SE models. Technight said all this.

Also keep in mind with the huge volume of SEs produced, its probable later models has boards swapped in form earlier models, etc.

 

takimoto

Well-known member
I have 2 SE and both have battery holder.I think we have later version in Japan like SE/30.(socketed CPU SE/30's are very rare in Japan)

And they are FDHD.

 
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