HP Laptop dies when I remove the ac adapter.

[carlcarl]

Starts up only with ac adapter plugged in. Battery does recharge and is fine.

 

[clutchc]

How do you know the battery charges and is fine? Seems like the battery isn't holding its charge. Or the charger isn't doing its job.

 

[carlcarl]

How do you know the battery charges and is fine? Seems like the battery isn't holding its charge. Or the charger isn't doing its job.

The battery reads 100% when running the laptop with the adapter plugged in. I also had an older battery that showed 12% and after leaving it in awhile it rose to 29%. My main battery is good.

 

[clutchc]

All 100% means is that the battery has charged as much as it can. To a full +12V. A battery that has weak or dying cells may fully charge itself to +12V or more, but it won't hold the charge. Or it will only charge the part of itself that still works, in effect leaving you with a tiny battery too little for the system to run very long on. I suspect the battery first, the charger last.

 

[ex_bubblehead]

The battery may well accept a charge, and indicate 100% as long as power is applied, but be incapable of holding that charge under load. Either try another battery in the laptop or try the suspected bad battery in another laptop.