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Introduction

If your Lenovo ThinkPad 285 shows the wrong time or BIOS errors when starting up, the CMOS battery might be dead. This small battery helps your laptop remember settings when it’s turned off. Before you begin, make sure the laptop is off and unplugged. Follow this guide to safely replace the CMOS battery and get your laptop working normally again.

What you need

Step 1 Back Panel

Lenovo ThinkPad A285 CMOS Battery Replacement, Back Panel: step 1, image 1 of 3

Lenovo ThinkPad A285 CMOS Battery Replacement, Back Panel: step 1, image 2 of 3

Lenovo ThinkPad A285 CMOS Battery Replacement, Back Panel: step 1, image 3 of 3

Flip your laptop over so the bottom panel is facing up.
Use a Phillips #0 to loosen the five screws holding the back panel to the laptop.
These screws do not come all the way out, so loosen until free spinning.
Lift the bottom of the panel to separate the back panel away from the device.
Remove the back panel.

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Step 2 Battery

Lenovo ThinkPad A285 CMOS Battery Replacement, Battery: step 2, image 1 of 2

Lenovo ThinkPad A285 CMOS Battery Replacement, Battery: step 2, image 2 of 2

Use a Phillips #0 screwdriver to remove the four 5 mm screws connecting the battery to the device.
Slide the battery away from the connector on the motherboard to remove it.
When replacing the battery, make sure to slide the fins on either side of the bottom edge of the battery into the their respective slots.

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Step 3 CMOS Battery

Lenovo ThinkPad A285 CMOS Battery Replacement, CMOS Battery: step 3, image 1 of 1

Locate the CMOS battery. It is a small, round, yellow battery directly connected to the motherboard.

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Step 4

Disconnect the CMOS battery connector.
Use a spudger to gently pry up the CMOS battery.

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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.