Dreamcast CMOS Battery Replacement
Dark Sakul and 7 other contributors
Last updated on May 3, 2020
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5 comments on steps, 9 guide comments.
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Community-Contributed Guide
An awesome member of our community made this guide. It was not created by iFixit staff.
Introduction
Go to step 1 ↓When a Dreamcast ask for time and date every time you power on your system, your CMOS battery is dead. This guide shows how to replace the CMOS battery.
Please note this guide is outdated and I am going to be updating this guide.
What you need
Parts
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Vertical CR2025 Coin Cell Battery Holder For sale from another site
Sometimes appear on eBay as Dreamcast CMOS or Clock battery holder
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ML2032 Rechargeable BatteryAffiliate linkAvailable for sale on Amazon
You want the Rechargeable 2032
Tools
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Safety Glasses4.9
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Locate and remove all four black 12mm Phillips #02 screws from the underside of the console.
Ask FixBot
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Turn the console right side up.
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Remove the top cover by gently lifting the upper portion of the console.
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Disconnect the white controller cable by gently pulling the the cable while wiggling it back and forth until it detaches from the controller board.
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Note where the positive and negative terminals go.
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Desolder the old CMOS battery from the controller board.
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Solder the replacement battery holder to two electrical wires.
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Solder the opposite ends of the wires to the controller board. Make sure to match corresponding points on the board with where the previous positive and negative terminals were.
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Reinsert the controller board.
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Attach the battery holder inside with a self adhesive substance, such as double sided foam tape.
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Insert the battery into the battery holder.
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Reverse the disassembly directions to reassemble your Dreamcast.
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Once your Dreamcast is reassembled, go ahead and connect the Dreamcast to your TV or monitor and power, and reset the clock.
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To reassemble your device, follow these instructions in reverse order.
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9 Guide Comments
Something that should be noted, even if the pictures kind of hint at it, is that the power board - the large board to the left of the console in Step 3, picture 1 - needs to be removed BEFORE the controller board can be taken out. On my DC the pins that connect the power board to the motherboard have a surprisingly strong grip, so I needed to pull up on that end with some force to get it off. Definitely something to be careful with, as you don't want those pins getting bent out of shape, never mind broken.
Dont use non rechargeble batteries. you can replace it with the little square batteries you found in chinese mp3 headphones… they’re 3.7v, 2000mah and are perfect for the console. This kind of lithium polimer batteries tend to hold charge for as much as six months according to my experience. And they’re easy available, if you can’t find one, just purchase those little chinese micro SD mp3 players/headphones , they’ll have one of this kind inside. Be sure the voltage is 3.7 at a maximum 2.000 mah
