HP Presario CQ62-100 CMOS Replacement Battery 3V 200mAh
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HP Presario CQ62-100 CMOS Replacement Battery 3V 200mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
HP Presario CQ62-100 CMOS Replacement Battery 3V 200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3V
Amp
200mAh
HP Presario CQ62-100 Series — 3V Lithium Replacement Battery (GC02000KJ00)
This is a 3V 200mAh lithium CMOS backup battery for the HP Presario CQ62-100 series laptop. It replaces OEM part GC02000KJ00 and sits on the motherboard to power the RTC circuit and retain BIOS settings when mains power is removed. Without a functioning cell, the clock resets and stored configuration is lost every time the laptop is unplugged.
- CQ62 series compatibility: The CQ62-100 through CQ62-103TU and 149 additional variants share the same motherboard CMOS socket, connector footprint, and 3V retention voltage requirement. One cell fits the full production run of this chassis.
- Bench tested on actual hardware: We verified the cell holds above the 2.8V minimum retention threshold under no-load and confirmed the BMS handoff to the RTC circuit remained stable after a full power cycle with mains disconnected.
- Post-install clock correction: After fitting the new cell, enter BIOS immediately and set the correct date and time, then save and exit. The RTC circuit loses its reference during the swap, so any power interruption resets the clock to a default value that must be manually corrected after the swap.
BIOS clock resetting to 2000 after every power cycle
The RTC circuit in the CQ62 draws continuously from the CMOS cell to maintain the clock while mains power is absent. When the cell voltage drops below 2.8V, the SRAM loses retention voltage and the clock defaults to a hardcoded date — typically January 1, 2000. Setting the correct time in BIOS only holds until the next full power-down because the depleted cell cannot sustain the circuit. Replacing the cell is the only fix; the RTC cannot draw from the main battery pack once it drops below threshold.
CMOS checksum error on boot after fitting a new coin cell
A checksum error after a new cell install usually means the BIOS detected a mismatch between stored settings and the cleared SRAM — not a fault with the new cell itself. When the old cell was fully depleted, BIOS settings were lost entirely, and the new cell simply powered up a blank SRAM state. Enter BIOS setup, confirm or re-enter your settings, then save and exit. The checksum error clears once BIOS writes a valid configuration back to SRAM at the correct retention voltage.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: HP
- Manufacturer: CS
- Series: Standard
- Color: Green
- Product Type: Lithium
- Battery Type: Lithium
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My HP Presario CQ62 keeps showing the wrong date every time I shut it down overnight — even though I keep correcting it in Windows. What's actually failing?
The CMOS cell on the motherboard has dropped below the 2.8V minimum retention voltage, so it can no longer power the RTC circuit while mains power is absent. Windows corrects the clock at startup if you have internet time sync enabled, which masks the fault — but the underlying cell is still dead. Replacing the GC02000KJ00 coin cell fixes this permanently. After the swap, enter BIOS and manually set the correct date and time before booting into Windows.
I fitted a new CMOS cell and the CQ62 still shows a CMOS checksum error on every boot. Did I get a bad cell?
Almost certainly not — the cell itself is fine. When the original cell was fully depleted, the BIOS settings stored in SRAM were lost completely, and the new cell powered up a blank or corrupted configuration. The checksum error is the BIOS flagging that mismatch. Enter BIOS setup, review every setting on each page, then save and exit with F10. That writes a valid checksum back to SRAM and the error will not return on the next boot.
The contact spring in the CMOS socket on my CQ62 looks flat and corroded — the old cell had leaked. Will a new cell still make contact?
A corroded or flattened spring is the most common reason a new coin cell seats correctly but shows no voltage to the RTC circuit. Clean the contact with a cotton swab and isopropyl alcohol first, then gently lift the spring with a small flathead screwdriver to restore its original tension. If the spring is too far gone, the socket will need resoldering — a flat spring cannot maintain the pressure contact the 20mm cell requires. Confirm the new cell reads at or above 3.0V at the socket terminals before closing the chassis.
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