m15 R2, flashing red power button, battery doesn't work after installing latest BIOS

Do a battery discharge and disconnect the battery from the motherboard.

Disconnect the CMOS battery and then disconnect the AC adapter.

Hold the power button for 30 seconds.

Then only plug in the battery and leave the CMOS unplugged.

Hold CTRL+ESC and turn on the laptop.

thanks for the reply... my challenge is that my battery is at 79%, it is not charger neither discharging as the moment I take out the AC adapter the laptop shutdown.... it is not even trying to use the battery available.... I unpluged the battery from the motherboard and connected it back but nothing changed.... any advice for this ? 

Are you able to configure in the BIOS that it can use the battery now? Do you have  a message saying the battery isnt connected or is not an authenthic dell.

I verified in the BIOS setting.

Battery Health: This Battery is performing normally.

I am thinking to still remove the CMOS and leave it out and battery out for a little bit?

Secondly, this all happened right after BIOS update could that have some kind of impact on this? this all seems to unreal to be a co incidence.... 

Hi @mmafa welcome to this free user to user Alienware laptop discussion forum. This is not Dell Support. 

If BIOS update integrity in doubt, how was Alienware m15/m17 R2 System BIOS Version 1.13.0 installed? Alienware m15/m17 R2 System BIOS | Driver Details | Dell US 

Alienware m15 R2 BIOS update Installation Instructions are very specific, the file shall be manually downloaded onto m15 R2. To ensure the integrity of your download, verify the checksum value before installation. Do not try and install BIOS update over the internet. Update the BIOS on your Alienware PC - YouTube

[This user does not work for Dell and volunteers their free time. Please remember to say thank you by clicking on Kudos as this user's only reward.] 

I use the alienware update utility to update all drivers/BIOS. As I mentioned in the original post my laptop started acting funny the very same day I installed the BIOS, the reason of that was so that other people can share with me if they faced any similar challenges and if so, kindly share what did they do to resolve the issue.

Hi @mmafa thank you for sharing update. 

The Alienware Update utility and Dell SupportAssist application, both install over the internet, and should not be used to install BIOS updates. BIOS update Installation Instructions are very specific. 

thanks for the knowledge.... i have been using alienware utility for managing my updates... I am not sure but I might have missed some BIOS update... the version installed is 2.12 and it is the latest one available on the dell website... what do you recommend, should i try to downgrade the BIOS? or replace battery... I am kinda lost here... I am in a remote area where I cannot get a new battery right away... 

just another thing to add ... when I boot up the system I get a selection menu from supportAssist right at the very beginning.. it says 

"Real Time Clock Error

System SMOS Checksum Bad

Time-of-day not set - please run setup program "

it gives me option for 1:Continue 2: BIOS Setup 3: Diagnose

I appreciate your feedback guys!. Thanks

So thats a CMOS battery issue. Replacing that should be easy but I recommend doing a BIOS reflash to the same version if possible and see if that helps.

Hi @mmafa thank you for sharing update. 

Although Dell BIOS updates are provided, there is no requirement to install BIOS update unless it has a specific function you want. 

The BIOS updates are very small, and incremental installation is required to install all the functions. However, you may not want the functions in a specific BIOS update and skip to the update you want. So if everything is working on your system, there is no requirement to downgrade the BIOS to an Old version. 

If m15 R2 battery not charging properly, it may be at end of life, and Battery Report will provide battery status. How to generate a Battery Report in Windows 10 | Windows Central If a new battery is required, Laptops without battery are designed to function as Desktop powered by ac adapter. The Dell charging circuit is designed to protect the laptop and getting the approved Dell OEM battery is recommended, Dell OEM Original Alienware m15 R2 / m17 R2 76Wh 6-cell Laptop Battery is Dell Part Number (DP/N) Y9M6F. 

Thanks again for the valuable feedback. After running the battery report on windows 11, Found the following. I guess the battery is dead... I will order a battery and replace and see how that goes. gonna be a 6 week wait before we I can travel back and get the hold of the battery.

Hi @mmafa thank you for sharing m15 R2 Operating System is Windows 11. 

Look at image for Battery capacity history. When full charge capacity is very low, it is time to get new OEM battery. How to Check Laptop Battery Health in Windows 11 [Guide] | Beebom The following images says my 17 R5 Battery full charge capacity is still very good at 91.7%. 

thanks for your support through this. I will get a new battery once I get back home. I work in a remote area so have to wait till I get back!. 

did get any notification about this message.... I will check for a guide how to go about reflashing BIOS... the ones I saw so far needs the battery to be working to be able to go in BIOS Recovery utility to downgrade BIOS...