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137361
March 24th, 2011 05:00
System battery voltage is low
Hello,
I have a 100 desktops of the type Dell optiplex 780. All seem to work fine except 1.
This particular desktop boots with the error "System battery voltage is low" Press F1 to continue. F2 for setup and F5 for diagnostics.
I've been googling and checking forums for days now. Finding different answers. But so far none of them work.
I already replaced the CMOS battery. Even switched the old one to another desktop. And it works fine. So battery can't be bad.
Also tried to discharge the battery, like a colleague suggested by putting it in upside down for 10 secs.
I've plugged the pc in different power outlets with different cables. Since there were some messages saying this might be a issue. But other pc's on these have no issues.
So i'm 100% sure something is wrong with the desktop machine. Any ideas except calling a tech?
Tom Green
322 Posts
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March 24th, 2011 07:00
Hello STEFANOVITCH85
You need to thank your colleague, you never put a battery in upside down.
You probably burned out part of the circuit and mobo can't see battery.
You discharge cmos by unpluging the computer and removing battery then
press and and hold power buttom in for about 30 seconds.
The battery is NOT rechargeable so why would you need to discharge it?
Never put a battery in upside down, that destroys the circuit.
Hope this helps.
Tom
shesagordie
12 Elder
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46K Posts
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March 24th, 2011 10:00
stefanovitch85
Try the following solution from this POST and see if it helps. Quote:
To get the motherboard to recognise this new battery properly you have to power cycle the computer 3 times (switch it on, get it to POST then switch it off again).
After the third power cycle the low voltage alert message should disappear.
If the alert message still displays, double check the output voltage of the replacement battery.
It should read anywhere from 3V to 3.2V.
If it does then the sensing circuit on the motherboard it faulty.
You could also, try clearing the event log in System Setup [BIOS].
Bev.
RoHe
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45.2K Posts
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March 24th, 2011 13:00
And make sure the battery socket is clean and you didn't leave any fingerprints on the battery when you installed it. Hold it by the edges or with a lint-free cloth.
Ron
sradams1977
1 Message
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July 4th, 2016 02:00
This worked for me.
www.youtube.com/watch
shesagordie
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46K Posts
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July 4th, 2016 07:00
This thread has been locked due to it's age, if you have a similar issue, please use the 'New Post' feature at the top of this page and start a new thread.
Bev.