BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Discuss hardware, PC, laptop, software help... whatever.
User avatar
Win10-Hater
Posts: 76
Joined: 19 Jan 2021, 08:17
Location: Bengaluru, Karnataka, India
Has thanked: 76 times
Been thanked: 26 times
India

BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Unread post by Win10-Hater »

Hello all, I recently replaced the battery on my laptop (Dell Latitude e5420), but found that on every cold boot, the date and time resets to sometime in September 2015, requiring a reset always. This does not happen on reboots though. Is there a solution to this problem?
Huge fan of Windows Vista, 7, 8.x, XP, 2K, ME and Linux, especially Zorin Linux, Ubuntu, elementaryOS and Mint.
I hate Windows 10. I am the last person one could ever convince to downgrade to Windows 10.

User avatar
K4sum1
Lazy Owner
Posts: 919
Joined: 11 Jan 2021, 07:40
Location: ur dads house
OS: Windows 8.1 x64
Has thanked: 583 times
Been thanked: 269 times
Contact:
United States of America

BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Unread post by K4sum1 »

I think the laptop has a CMOS battery, and for some reason the CMOS isn't powered by the laptop battery. I don't know tbh.
I don't know what I'm doing hit album by Brad Sucks

User avatar
Iceman
Posts: 57
Joined: 19 May 2021, 04:56
Location: Arctic Abyss
Has thanked: 11 times
Been thanked: 7 times
United States of America

BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Unread post by Iceman »

I agree with K4sum1, Every computer has a "coin" battery to keep system configuration settings saved, date and time included. Typically a 2032 battery as in my case. Most laptops I've owned have an easily accessible panel on the bottom, likely retained by a small screw, to access it. I'm not familiar with that exact model, but it should be pretty straightforward replacing it.
Desktop: Core i7-6700K OC, GeForce GTX 970 SC, Win Pro 7/10 x64; Laptop: Core i7-3632QM, Win 7 x64

User avatar
MelonicOverlord
Posts: 54
Joined: 11 Jun 2021, 18:28
Location: England
Mood: Probably Depressed
OS: Gentoo Linux x86_64
Has thanked: 3 times
Been thanked: 9 times
Contact:
Great Britain

BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Unread post by MelonicOverlord »

The E5420 has a plastic wrapped battery holder which has a 2 pin connector connecting onto a motherboard. To replace this, you'll either need to cut back the plastic, pull off the pads and solder in a new battery (CR2032 I would guess) or order a new CMOS for these which is dirt cheap since pretty much every machine using that style of battery uses the same 2 pin connector. The connector on this machine seems to be located on the BOTTOM of the motherboard, but rather stupidly shrouded by plastic meaning you're going to need to most likely get the entire bottom panel off - this could be as simple as just removing the rest of the bottom cover, or as complicated as having to have the entire palmrest off and motherboard out (so basically the entire machine in pieces) however I am unsure as I do not own one.

Chances are with the battery replacement causing it, it's either really good timing on the CMOS dying too, or more likely the CMOS has been dead for a while and your new battery does not for some reason have the ability of sustaining the BIOS settings (which is more likely if it's aftermarket and not Dell).


Here is the picture of a motherboard on these, notice the battery itself if located to the RIGHT of the CPU socket and to the LEFT of the USB port which would usually be on the LEFT side of the machine at the FRONT during normal operation.

Image


This is the sort of replacement battery you will need, colour of it doesn't really matter. At the end of the day it is just a glorified CR2032 battery which has been soldered between two pads, with a plastic cover and a connector on the end. This is basically just a way of saving space on the board.

Image


This should solve your issue, and if not try stuff like a BIOS update, your old battery back in, etc.
Image
professional /g/entooman

Pro Linux User
Pro PC Builder
Slightly Pro Front End WebDev
Sometimes Pro Gamer

MAIN PC: i5 9600KF@4.7GHz, 6600XT, 32GB DDR4 3000MHz RAM, Gigabyte Z370XP SLI, 250GB + 500GB SSDs, 2TB HDD, Gentoo + Windows 11

LAPTOP: i5 4300U, Intel HD4400 Graphics, 2x240GB SSD, Gentoo + Windows 10

User avatar
MelonicOverlord
Posts: 54
Joined: 11 Jun 2021, 18:28
Location: England
Mood: Probably Depressed
OS: Gentoo Linux x86_64
Has thanked: 3 times
Been thanked: 9 times
Contact:
Great Britain

BIOS date and time always resets on Dell Latitude e5420 after replacing battery.

Unread post by MelonicOverlord »

I just realised how late I am jesus christ oopsies. Hope you sorted it already lol

Havent logged into eclipse for ages so like everything was showing notifications and thought there was a load of activity here now lol...
Image
professional /g/entooman

Pro Linux User
Pro PC Builder
Slightly Pro Front End WebDev
Sometimes Pro Gamer

MAIN PC: i5 9600KF@4.7GHz, 6600XT, 32GB DDR4 3000MHz RAM, Gigabyte Z370XP SLI, 250GB + 500GB SSDs, 2TB HDD, Gentoo + Windows 11

LAPTOP: i5 4300U, Intel HD4400 Graphics, 2x240GB SSD, Gentoo + Windows 10

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest