Maybe your battery aging, battery's life is about a year (I also use laptop) If you often use external power supply, take out the battery, it will extend battery life, because the battery's life depends on the times of charging and discharging. You say the screen is brighter, some laptops have a default value of setting LCD screen in computer system, you can adjust the brightness youself. Press "EN" key, and press "upward" at the same time, the screen can be brighter. Or you can get a replacement battery, I don't know what's the brand of your laptop, I have bought a battery online, the quality is OK.
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Tips to increase battry life:
1. Never charge when battery already full.
2. Keep low Brightness.
3. Keep volume medium.
4. Always use headset to hear songs or see films.
5. High graphics games never play on laptops it reduses your lapy's battery life.
6. Never use laptop up to 0% battery power.
7. Close background processes using task manager(these processes not essential but consume battary.
Open Control Panel, Power Options, set to High Performance, you didn't supply the model of HP or the OS?, change power plan or Advanced power settings, to Sleep and Hibernate to Never, adjust other settings. Always shut down your laptop when not in use, your laptop will last longer, extend component life and will not be subjected to power surges, remove the battery if used on AC for extended periods. A reboot everyday will reset the laptop's OS.
Run a battery check. For this go to desktop, hit F1. In the help screen choose Power and Battery. Go to Battery check.Connect your power supply and run the test. It will give you the status of the battery.
It is possible you have two dud batteries. Recharageable batteries have a limited life, they have a finite number of charge and discharge cycles.
With the battery removed and only the power supply connected and the laptop powered up, when you touch the connector on the laptop and the laptop does not shut down then the laptop connector is OK.
If you can verify your new battery is OK the the fault could be the power supply adapter, if may not produce enought current to run and charge the battery. Try charging the battery overnight by turning off the laptop and leaving on the mains t charge. Borrow a mains adapter and test it on your computer.
You can also check the BIOS setting for power management, ie. hibernate, low power shut down etc.
take the battery out. unplug the AC.
push and hold the power button for 20-30sec. plug in the AC and turn it on. if the laptop comes on, let it finished the loading. shut it down and insert the battery.
you may have to this twice.