Okay, a little clarification is in order here. First of all, CMOS refers to the memory storage technology that holds certain pieces of configurable memory. CMOS RAM takes very little power to maintain storage, so it is normally backed up with a coin cell battery.
When that battery dies, the memory it holds gets lost. That information can contain things like BIOS settings and the date and time information, which is why that battery is often also referred to as the RTC, or Real Time Clock battery. Note that nothing prevents you from using the computer even with a dead battery, but you may have to set the date and time and any necessary BIOS settings every time you turn off the computer.
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The instructions you need to replace that coin cell battery are [document|5946|Maintenance and Service Guide] under your computer's device page. Go to Page 83 and read through the section titled RTC Battery; it has all the information you need to replace that battery. The HP part number is 651948-001; looking up that part it's a coin cell that comes with two wires and a plug pre-connected so you just have to plug it in. Here's an example I found; there are several more, but most of them are charging in the neighborhood of $30 for the darn thing.
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The instructions you need to replace that coin cell battery are in the [document|5946|Maintenance and Service Guide] under your computer's device page. Go to Page 83 and read through the section titled RTC Battery; it has all the information you need to replace that battery. The HP part number is 651948-001; looking up that part it's a coin cell that comes with two wires and a plug pre-connected so you just have to plug it in. Here's an example I found; there are several more, but most of them are charging in the neighborhood of $30 for the darn thing.
[link|https://www.walmart.com/ip/Replacement-RTC-CMOS-Battery-for-HP-Part-Number-651948-001/3240746265|Replacement RTC CMOS Battery for HP (Part Number) 651948–001 - Walmart.com|new_window=true]
Once you've got the new battery in place, you'll have to go through and set the date and time and any other BIOS settings you need, but the new battery should maintain those settings for the next couple of years at least.
Okay, a little clarification is in order here. First of all, CMOS refers to the memory storage technology that holds certain pieces of configurable memory. CMOS RAM takes very little power to maintain storage, so it is normally backed up with a coin cell battery.
When that battery dies, the memory it holds gets lost. That information can contain things like BIOS settings and the date and time information, which is why that battery is often also referred to as the RTC, or Real Time Clock battery. Note that nothing prevents you from using the computer even with a dead battery, but you may have to set the date and time and any necessary BIOS settings every time you turn off the computer.
The instructions you need to replace that coin cell battery are [document|5946|Maintenance and Service Guide] under your computer's device page. Go to Page 83 and read through the section titled RTC Battery; it has all the information you need to replace that battery. The HP part number is 651948-001; looking up that part it's a coin cell that comes with two wires and a plug pre-connected so you just have to plug it in. Here's an example I found; there are several more, but most of them are charging in the neighborhood of $30 for the darn thing.
[link|https://www.walmart.com/ip/Replacement-RTC-CMOS-Battery-for-HP-Part-Number-651948-001/3240746265|Replacement RTC CMOS Battery for HP (Part Number) 651948–001 - Walmart.com|new_window=true]
Once you've got the new battery in place, you'll have to go through and set the date and time and any other BIOS settings you need, but the new battery should maintain those settings for the next couple of years at least.