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Method for a CMOS keep-alive battery clip Disclosure Number: IPCOM000007979D
Publication Date: 2002-May-09
Document File: 4 page(s) / 282K

Publishing Venue

The Prior Art Database


Disclosed is a method for a CMOS keep-alive battery clip. Benefits include improved functionality and improved usability.

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Method for a CMOS keep-alive battery clip

Disclosed is a method for a CMOS keep-alive battery clip. Benefits include improved functionality and improved usability.


              Information in volatile memory, such as system settings in CMOS, is conventionally lost when the battery is removed for replacement or other purposes. When system settings are lost, the user frequently cannot restart the computer, prompting a call to technical support.

              Equipment manufacturers have conventionally attempted to avoid this problem by using batteries with a longest life, but any battery has a finite lifespan and can fail prior to the user discarding the original PC. The standard battery in use in all PCs today is the model 2032 lithium coin cell with an expected life of 3 years. Most consumers do not replace PCs every 3 years. As a way to recover from the impact of interrupting power to the memory circuits, some users have learned, through prior experience or technical help-line recommendation to maintain a record of the systems settings. They then must be manually reentered after battery change.

General description

              The disclosed method is a battery holder that enables battery replacement without interrupting the power source to volatile memories, such as CMOS memory. BIOS settings in PCs are maintained during the battery replacement. The design makes backwards insertion of the coin-cell battery impossible, and provides full retention in all axes for shock and vibration. The battery holder can be vertically or horizontally mounted.

              This unique design of a coin cell battery holder not only prevents the battery from being inserted backwards but it maintains continuity with the old battery while the replacement battery is being inserted. Not until after full continuity with the new battery is established is continuity with the old battery broken. Anything in volatile memory is preserved. The design also makes mixing up the new and old batteries during replacement impossible because the replacement battery is used as the pusher to remove the old battery. The new battery is automatically locked into place as soon as the old battery gets pushed out the other end.

The key elements include:

§         A plastic U-shaped channel with one side in the shape of anode side of the coin cell battery

§         Metallized inside surfaces to make contact with the cathode and anode of the battery

§         Conductive fasteners (like a rivet) to make connection to a metal lead frame on the outside of the holder

§         Stamped metal lead frame shaped so that it provides two functions:

-         Leads for vertical or horizontal mounting

-         Spring retention tabs to stop the new battery in its correct position

§         Continuity with the...