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Trying to find the location of the cmos battery. I have found a "dime sized" battery, but it is soldered to the motherboard.

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and — short, practical guidance for replacing the RTC/CMOS cell on an A215-series laptop.

Before you start: disconnect the AC adapter and remove the main battery, then discharge residual power by holding the power button for 10-15 seconds. Use an antistatic wrist strap or at least touch a grounded metal object frequently. Have a multimeter handy to confirm the battery is actually low before you replace anything.

Replacement options and safe steps:

  • Verify type and voltage with a multimeter or by reading any markings on the cell. That determines whether you need a coin cell, a small rechargeable pack, or a pigtail-style replacement.
  • If the cell must be removed from the board, use a low-wattage soldering iron (25-40 W), flux and desolder braid or a solder sucker. Heat each pad briefly; avoid long, direct heat to prevent lifting PCB pads or damaging nearby components.
  • If soldering is not comfortable, replace the cell with a short pigtail and a battery holder: desolder one lead, tack the new holder wires in place, secure the holder inside the chassis with tape or a small screw so it cannot short.
  • If a direct drop-in replacement is available from parts suppliers, that is the easiest route. Otherwise consider a professional repair shop to avoid accidental board damage.

After replacement: enter BIOS to set time/date and any custom settings. If the system still loses time or settings, inspect the new solder joints and PCB traces for cracks, and recheck the battery voltage. Most laptops use a single RTC battery, as noted, so once this is corrected the BIOS should retain settings normally.

Useful precautions: work with good lighting, keep small screws organized, and avoid overheating components. If uncertain about disassembly order for the A215 chassis, consult the official service manual or a teardown guide before cutting or prying.

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there usually is only one!

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