Read guide note How to rebuild a laptop CMOS battery

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Introducción

If your laptop's CMOS battery is dead and the OEM no longer sells new ones (and aftermarket ones are hard to find), you can take the dead battery apart and replace the bare cell so your laptop can hold the CMOS contents again.

***''IMPORTANT: DUE TO THE ASSOCIATED DANGER IF THINGS GO WRONG, THIS IS ONLY RECOMMENDED FOR OLDER NOTEBOOKS WHERE THERE ARE FEW OR NO THIRD PARTY COMMERCIALLY AVAILABLE REPLACEMENTS. If a pre-built replacement can be purchased, this is (generally) better as the cost is similar to this procedure. This procedure is also error-prone and can create the same issue as a dead battery if the tape fails.''***

***''Guide notes:''***

* The cell does not need to be covered 100%. However, due to the risk of an explosion, you MUST cover every visible area at least to the point it is "protected." Liquid electrical tape is used to do this for this guide. I***''t can also be removed cleanly if something goes wrong and provides a better seal without the risks introduced by using heat shrink and a butane flame.''***
* Laptop disassembly is not covered.
** ***''Every laptop is different, so yours probably differs from the one this was pulled from. For instructions, check iFixit or the manufacturer's website.''***
** ***''NOTE: SOME TOSHIBA LAPTOPS SOLDER THIS TO THE MOTHERBOARD.''***
* ***''This guide ONLY applies to coin cell rebuilds. Do not use this guide for other batteries.''***
* ***''When adding tape to the cell, be very careful not to create a direct short.''*** To avoid this, place the tabs slightly higher than the factory and cut the tape sort but will also hold reliably.

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