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2 Bronze

Dell power manager "Primarily AC Use" misleading and potentially dangerous

Primarily AC Use
Recommended for users who primarily operate their system while plugged in on an external power source.
This settings may extend your battery's lifespan by lowering the charge threshold.

When this profile is enabled,
battery immediately starts charging (no min threshold it seems...)
And tops it of to 100%
After that it start charging again when the battery drops to 99% ...

I am not an expert on the topic, but this seems as the worst possible usage of the battery,
when you are indeed primarily on AC use.

 

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5 Rhenium

Re: Dell power manager "Primarily AC Use" misleading and potentially dangerous

Welcome to the Dell Community @draev 

Dell Command | Power Manager User Guide:

https://www.dell.com/support/manuals/us/en/04/dcpm2.1/userguide_dell-v1/extending-battery-charge?gui...

Since you did not post your model number, I could not say for sure but your BIOS may also have the option to change the "Threshold" levels.

80% ~ 20% seams to be the recommended levels.

Best regards,

U2

HP EliteBook 8770w i7-3630QM 32GB
HP ZBook 17 G2 i5-4310M 16GB
HP ZBook 17 G4 Xeon E3-1505M v6 32GB
HP Color LaserJet M553dn 40ppm
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2 Bronze

Re: Dell power manager "Primarily AC Use" misleading and potentially dangerous

Hello, model is Latitude 5491.
I just checked the bios settings and they are the same, 
just a checkbox for "Primarily AC Use".
I can see / change the specific values only for "Custom" profile, and it was set to 50%, 80%

And again  Custom profile is working as expected, I switched to that today, after testing it in more details.
But I was running on "Primarily AC Use" for a month or so ... as it fits my usage, and the description sounded perfect too.

I wanted to know if there is something I am missing, or there is a problem with the software.

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3 Silver

Re: Dell power manager "Primarily AC Use" misleading and potentially dangerous

Hi - I have the Dell 7400.  No matter which model we are talking about, you are correct.  I never used that "primary AC use" setting for exactly this reason - I had not idea what it meant.  🙂

I have "custom" setting with min 75% and max 80% because I do move around the home office and don't want the battery to be "too" low.  On my gaming laptop that is always plugged in, I have it set for 60%.

BTW, if you have Dell Power Manager, you can use this instead of going into BIOS when you want to make changes.

R

 

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2 Bronze

Re: Dell power manager "Primarily AC Use" misleading and potentially dangerous

I could've sworn back then that setting mine to "Primarily AC Use" capped the battery charge to 75%. Now that I set it again, it immediately charges to 100%. Weird. I'll use custom then, thanks.
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