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Mac II batteries: Replace with what?
Posted by: egrath on 2022-12-16 11:21:41
Hi,

i'm currently reworking a old Mac II logic board and think about how to best replace the two 1/2 AA batteries. How have you solved this?

The most simple idea to me was to just wire and solder double battery clips on it and just use regular AA batteries in series:

1671218337802.png

This will give the exact same voltage as the original 1/2 AA Lithium batteries that where in, but only when they are new.

Any other suggestion?

Best regards,
Egon
Posted by: Phipli on 2022-12-16 11:28:16
I'd try something like the ER14250 option here :

www.ebay.co.uk

Battery Holder Case Box ML1220,ER14250,CR 2477,1/2AA,12V 23A,A23L 23A12V for DIY | eBay

Find many great new & used options and get the best deals for Battery Holder Case Box ML1220,ER14250,CR 2477,1/2AA,12V 23A,A23L 23A12V for DIY at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk

And some SAFT 14250 3.6v batteries from Amazon.
Posted by: LaPorta on 2022-12-16 11:39:09
As mentioned above, I just solder in standard battery holders like you'd find in a IIfx, SE/30, and the like.
Posted by: egrath on 2022-12-16 12:35:39
The issue i see with those 1/2 AA holders on the II board is the spacing. I already have some Keystone 108 1/2 AA holders and they have a spacing of 29.5 mm between their solder legs, the II has a spacing of 33 mm.
Posted by: Phipli on 2022-12-16 12:38:46
Yes, but different ones have different spacings - I linked the specific holders because the tabs are more flexible if they're off. You should be able to bend them to fit.

If you use 4x AAs they'll most certainly fit less well, leak sooner, and only be 2.4V!
Posted by: egrath on 2022-12-16 12:41:16
Ah, thanks for the hint with the ones you linked on ebay, thought that they all have the exact same spacing! Will go with them then, seems to be the most "professional" solution.
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