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How to replace soldered 2/3 AA CMOS battery?

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First post, by madrobby

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Hi,

I have a NCR 3333 486 PC which a 2/3 AA Tadiran battery apparently soldered on. Does anyone have tips on how to replace this type of CMOS battery? I've searched for this situation but could only find information on other types of CMOS battery replacements.

The board does not have an external battery connector.

I assume I need to snip off the leads and solder on cables w/ a battery holder, or perhaps just tape in a new 2/3 AA battery (I'm a newb with soldering and I'm not willing to mess around with soldering batteries, yet.)

Welcoming any suggestions!

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Reply 1 of 5, by gdjacobs

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I'd desolder the battery contacts and replace them with leads or header pins for an external rechargeable solution.

All hail the Great Capacitor Brand Finder

Reply 2 of 5, by dosgamer

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I'd stay away from anything rechargeable. As OP said, just solder some wires to a CR2032 socket and stick it to the board with some hot glue. This is safe and reversible if you want to improve on it later on.

Like, you know, just buy the same freaking battery: https://www2.mouser.com/ProductDetail/T ... gxsJPlzCM=

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Reply 3 of 5, by madrobby

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dosgamer wrote:

I'd stay away from anything rechargeable. As OP said, just solder some wires to a CR2032 socket and stick it to the board with some hot glue. This is safe and reversible if you want to improve on it later on.

Like, you know, just buy the same freaking battery: https://www2.mouser.com/ProductDetail/T ... gxsJPlzCM=

How amazing is it that not only this is still made, but the didn’t even change the design in 25 years... 😀

Reply 4 of 5, by keropi

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Why not replace it with a lithium battery like this? https://www.amazon.com/LS14250-Lithium-Thiony … y/dp/B005M3D0X4 ? I use one with a board that had a Tadiran 3.6v coin-shaped battery that just had no juice after 20 years 🤣

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Reply 5 of 5, by gdjacobs

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dosgamer wrote:

I'd stay away from anything rechargeable. As OP said, just solder some wires to a CR2032 socket and stick it to the board with some hot glue. This is safe and reversible if you want to improve on it later on.

Like, you know, just buy the same freaking battery: https://www2.mouser.com/ProductDetail/T ... gxsJPlzCM=

Hah! I didn't look at the battery closely enough and just assumed it was NiCd.

Still, the point is to install a solution that is inexpensive, easy to find, and a voltage match for what it's replacing and use wire leads to place it in a location that's convenient with less risk of component damage in case of battery failure (although lithium batteries are more reliable than crusty old NiCd units). Rather than stick it to the board, I'd probably find a spot to attach it to the case.

All hail the Great Capacitor Brand Finder

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