ML1220 CMOS Battery for Dell Vostro 15 5510 – BIOS RTC ML1220 XPS 13 Rechargeable CMOS Battery for PC Motherboard with 2 Wire Cable (1-Pack)

Fits and works on a 2016 Dell XPS 13 perfectly. If your laptop doesn’t turn on when you press the power button, it’s likely that the CMOS battery is dead. Once I replaced it with this battery, my laptop boots up!

When my BIOS kept losing time, I knew it was time for the dreaded CMOS battery update. After much research, I learned that it wasn’t a simple matter of just replacing a bare watch battery on the mainboard and that laptops favor rechargeable batteries nowadays. So, after confirming this was indeed the right part for my Dell XPS 9570 and that my Microsoft Bitlocker was disabled, I went about following a YouTube video that showed me how to remove the mainboard and flip it over so that I could replace the battery on the bottom left of the mainboard. (Why???? Did they put it under the bottom???). It was easy to unplug the old one and plug in the new one. (I did it fast so that I would not have to lose the BIOS settings.). I like that the new battery also has the adhesive pad. Then I had to figure out what to do with the cord…. As another review mentioned, the cord is rather long. After reassembling my iPad and starting it up, it booted right up after a nerve-racking longer than usual pause and asked me for the time and date for one last time. The dreaded job was done!!! I was so thrilled, I even braved bricking my laptop by updating my BIOS afterwards. I hope that this 3 to 8 year part lasts closer to the 8 years! All in all, this little battery seems to have been a great purchase!

Great seller - great product. Fixed my XPS - thanks Rome Tech!

It fit my Razer Blade 15 2021 Base Model, and comes with an adhesive sticker to stick it to the motherboard. It seems like it's doing its job.

Work as advertised. Great follow on support.

I ordered this ML1220 battery expecting a fresh one, but when I checked the voltage it was only 2.79V. A new ML1220 should be at least 3.0V or higher. This means the battery was already discharged upon arrival, which makes it unreliable for use. Very disappointed. I requested a refund.

While it appears to work fine, the wire was a bit too long for the space. (Space in laptops is always at a premium.) I managed to cram it in there however. Ease of installation isn't really Rome Tech's problem. For that I blame Dell for requiring me to almost completely disassemble the laptop to access the CMOS battery. Replacement would have been substantially easier if Dell's designers had considered perhaps placing the battery on the *other* side of the motherboard. Sheesh...

The CMOS battery (or as some folks call it the RTC (real-time clock) battery) is part of almost any computer, be it a laptop or desktop motherboard. This battery makes sure that the BIOS clock keeps time especially when the computer is powered down. RomeTech's ML1220 is an example of this and while there's probably nothing exciting to write about a CMOS battery, when trying to stick it inside of a laptop, crammed with other components, it's important to have the right battery. One suggestion I would recommend RomeTech include is a manual telling the installer that before install it, be gentle with plugging the battery in and out of the port it is in. (I kind of pushed a little to hard and the top of the port broke off, but fortunately the pints were still in place, and the battery wasn't damaged either. This was a superficial mistake that could easily be fixed with a little bit of Kapton tape (that yellow tape you see on other components). The other suggestion: tell users that they may have to twist the wires together (but not too tightly) so that the wires on the battery stay together and also reduce the amount of space used. (Even twisted together, this battery's cables might have been a little bit longer than the previous CMOS battery, so they might want to consider reducing the length of the wire by 50 to 100 millimeters). Maybe I'm just a little uncomfortable with the CMOS battery wires being so close to the laptop battery. Finally, it was wise to add an adhesive sticker so that the CMOS battery could be separated from any other components. The one that came with the laptop didn't have that. Then again, I don't think the laptop manufacture expected people to replace the hard drive or laptop battery when the user needed to do it. Hence the Torx bits and unibody design that they only want "technicians" to have access too. Replacing a CMOS battery should cost about as much as this one cost, and not "$1000" just so that the guy at the "Genius Bar" could try to sell you another computer. A jeweler wouldn't do that to you if you needed to replace the battery on an expensive watch. Overall, I am pleased with this product.