Tuesday 5 March 2019

How To... Replace The CMOS Battery On A Compaq Evo N410c Laptop

Changing the CMOS/RTC battery on the Compaq Evo N410c involves removing the keyboard and the wrist wrest:

To remove the keyboard, look for the screws with the keyboard symbol next to them and then remove them:

Then you must remove the additional memory (RAM) panel as shown here:

Once you have removed all the screws for the keyboard you need to remove the screws that hold the wrist-wrest on and as always, you need to remove the battery too:

Now you can turn the laptop over and remove the keyboard:

Next you need to carefully remove the wrist-rest to reveal the location of the CMOS/RTC battery:

Now all you need to do is remove and then replace the exhausted battery!

What happens if you can't find a replacement battery, or if you can find one they're too expensive?  Well, you can always make your own...

To make your own you are going to need the following items:

  • Sharp knife
  • Side Cutters (or scissors)
  • Heat Shrink
  • Heat Gun
  • A replacement Battery
  • Aluminium Foil Tape with Conductive Acrylic Adhesive

The first thing you need is the original flat battery from your Compaq Evo N410c laptop.  Once removed from the laptop you will need to carefully remove the plastic surround with a sharp knife.

Carefully remove the connectors from the battery and then using small pieces of the aluminium foil tape stick them on the correct sides of the new battery:

Once you have taped the connectors to both sides of the battery, cut a piece of heat-shrink tubing to size and then using a heat gun, shrink it to size to secure the connectors to the battery:

Now it's time to re-connect the battery to the laptop and screw it all back together:

Once you've replaced the keyboard and wrist-wrest (and put all the screws back) it's time to load up Windows and change the Date and Time:

It's also a good idea to enter the BIOS and change any appropriate CMOS settings and then save them.


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