Hi,
I know something of electronic theory. I've built simple things like PWMs and such from scratch. I'm not sure if this is the best place to ask, and I'm very open minded, so any pointers to other resources are greatly appreciated!
I have an old Pentium 100 Gateway laptop. It functions fine off of its AC->DC power converter. When I first recieved it (used), it ran for about 5 minutes off of its battery after being charged. Now, however, it will shutdown immediately after emiting a low battery warning. This is not in any way software related, as the warning and shutdown are all controlled by the laptop's own firmware. I have checked out the battery with a professional, and the NiCd cells themselves are in fine condition. They hold a charge and sustain reasonable opperating loads for extended periods. It's my conclusion that the laptop cannot read the battery level correctly and believes the battery is dead in error. The battery unit contains an IC that connects to the laptop via a lead along with the VDC and ground. I believe it's some sort of serial comm chip. I tried preventing the chip from making the connection with the laptop with no apparent change in behavior. I'm at a loss how to proceed. I would be happy if I could simply disable the laptop's ability to sense battery level at all and fool it into thinking it was at 100%.
I'm hoping someone could shed light on how the system might be designed to monitor power level, and/or what to look for inside the battery or laptop to gather more information.
Thanks!
I know something of electronic theory. I've built simple things like PWMs and such from scratch. I'm not sure if this is the best place to ask, and I'm very open minded, so any pointers to other resources are greatly appreciated!
I have an old Pentium 100 Gateway laptop. It functions fine off of its AC->DC power converter. When I first recieved it (used), it ran for about 5 minutes off of its battery after being charged. Now, however, it will shutdown immediately after emiting a low battery warning. This is not in any way software related, as the warning and shutdown are all controlled by the laptop's own firmware. I have checked out the battery with a professional, and the NiCd cells themselves are in fine condition. They hold a charge and sustain reasonable opperating loads for extended periods. It's my conclusion that the laptop cannot read the battery level correctly and believes the battery is dead in error. The battery unit contains an IC that connects to the laptop via a lead along with the VDC and ground. I believe it's some sort of serial comm chip. I tried preventing the chip from making the connection with the laptop with no apparent change in behavior. I'm at a loss how to proceed. I would be happy if I could simply disable the laptop's ability to sense battery level at all and fool it into thinking it was at 100%.
I'm hoping someone could shed light on how the system might be designed to monitor power level, and/or what to look for inside the battery or laptop to gather more information.
Thanks!