Hi I have a Inspiron 1545 (tag fwt15bs) 2010 model.
in 2014, my battery was no longer working. I used the laptop on direct power with battery removed for many months. Eventually i bought a new battery from a dell store quoting my model and service tag.
The new battery behaves weirdly.
Now in case of a power cut , the laptop stays on. The battery icon on the task bar shows either of 2 signs. One a blinking cross x mark or a blinking exclamation mark.
If it is a cross mark, the sign remains, and i can use the laptop as it is and the battery last as much it is supposed to.
If it is a exclamation mark, it shows a message that 99% battery is remaining and amount of time remaining (say 3-4 hours) but advises to connect a power source or alternate battery. The type of message you get when your battery charge is at its end. After 2-3 minutes, the laptop shuts down.
Now to resolve this, I restart the laptop. Once it restarts , the exclamation sign changes to cross sign and all is good. This happens every time like a alternate cycle. if the exclamation mark comes, a restart will definitely bring the cross mark.
Now there is no logic as to if the cross comes or the exclamation mark in the first place in case of a power cut. It is random.
Strange being the fact, the battery is brand new. I have flashed the bios but that did not solve anything.
Please let me know if this is a know problem and how to solve it.
Sometimes it becomes troublesome to restart as all sessions needs to be disconnected.
Go back to removing the battery and using just the adapter alone. It sounds like the replacement is not a good match for your old model. It would have been better to save the $100 for the battery and put it towards a new computer.