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try this app. http://biospassword.eu/remote-unlocker/download/ If that dont work, unplug the laptop, remove the batery, you may need to remove the keyboard or open the laptop an unplug the internal bios battery for a few minutes (5m will do it). then plug the power cord an turn it on to see if you can get into bios... remember to plug the internal battery to keep your bios changes.
as i do not know what laptop we are talking about here i asume its not a notebook if it is the time is slightly lower (6-8 hours) a normal lap top 10 - 12 hours. some super batery laptops come with an own (long) guide how to keep the batery alive.
to keep the batery alive a long period of time charge it from 50% not when its at critical.
If u can take out the batery when you are using cable and its fully charged it also has a longer life time. or just take out the cable when its at 100% and recharge it when it gets to 50%
dont have your computer in the lap it can over heat the computer/batery and the lifte time gets even lower.
You should remove the batteries to see if it will power up and start using the AC adapter, it does not need the batteries to run when it is on an AC adapter. It may have bad connection at the DC input jack assembly.
It does sound like your cmos battery. It is located on your system board. If your confident you can take the laptop apart and get the details from the battery and then goto a pc shop and buy a new one if not take the laptop to the shop and they can replace it for you.
not only do you need to remove the comos battery you have to short out the posts the battery connects to this will remove remaining power stored in any caps connected to the comos circuit after about ten minutes this should clear the comos remove battery unplug charger and remove comos battery the short the comos battery socket. there is still some voltage on the board stored in the capactors this will keep the comos in memory even with out the battery.
batteries have a charge memory in the, when you purchase a new battery the best thing to do is to fully drain the battery before charging it up, this will tell the battery that it needs full charge, if you charge the battery before this it will only charge the battery to a certain percentage. what you need to do now is find a way to fully discharge the batteries
This battery is located in a slot on the motherboard. It's been a while since I've had a 380 apart, and I can't remember whether it's on the top or the bottom of the board. Start by removing the keyboard, if it's on the top, you will be able to see it. If it's on the bottom, then you will need to remove the motherboard in order to get to it.