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Dell Latitude Modular Bay Battery not showing in BIOS

Posted on 2016-08-16
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Last Modified: 2016-11-22
We've got several Dell E6330 Latitude laptops with both a primary and a modular bay battery installed.  (We manually installed the bay batteries after receiving the units)

We began powering on the units and went to the bios to check out various settings. Surprisingly, on many of these units, the Battery Information screen in BIOS only shows (1) battery, the primary one.  We became concerned when more and more of the units did not display the attached second bay battery

However, THE FIRST TIME  you attach an ac adapter to the unit, while viewing the Battery Information BIOS screen, within 2-3 seconds, the second bay battery pops up and is displayed in the bios screen.  We then restart the unit without an ac adapter and the 2nd battery still shows both in BIOS and in Windows.

I'm trying to find out why it took attaching an ac adapter to seemingly 'activate' the bay battery.
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Question by:ejcrist
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Assisted Solution

by:Scott C
Scott C earned 350 total points
ID: 41757847
Maybe a bug in the BIOS.  Check BIOS versions across all of the machines.  See if there is any pattern.

Possibly needed the extra power on the secondary battery bay for it to be recognized initially in the BIOS.

If you want an "official" answer, I'd contact Dell support.
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ejcrist earned 0 total points
ID: 41757862
Yeah, I'm thinking the BIOS as well.....trouble is, to update the BIOS it has to have an ac adapter attached so I can't do a precise test.

I'll see what Dell says.
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by:nobus
nobus earned 150 total points
ID: 41758941
you can Always test this on one system - to see if it helps
there seems to be 1 bios update, version A16 - so verify which one you have
http://www.dell.com/support/home/us/en/04/product-support/product/latitude-e6330/drivers/advanced
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by:Scott C
ID: 41759255
Just an FYI...you can close the question yourself and award the points.
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Author Closing Comment

by:ejcrist
ID: 41765044
Probably is a bios issue and will conduct further tests. For now, attaching an ac adapter seems to trigger the bios and Windows to 'see' the 2nd battery.
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