Satellite 2450-201 wont start with battery power supply

Can anyone please help, I cannot power up through the battery at all. When connecting the AC supply, the laptop powers up no problem. And after the intitial power up, I can switch to the battery without any problem. But it won't let me power up through the battery at all.
Can anyone advice, is there any settings that will help or do I need a new battery?

Hi
How about the battery charging status?
Is the battery fully charged?
Try to disconnect the AC adaptor and remove the battery from the notebook for a several time (15-30min) then plug the battery again and try to power up the notebook.
I think also you should check if the issue happens also with the new power pack. Possibly there is something wrong with the battery and you need a new one.
Sorry for such general suggestions but you know, we can only speculate about the issues.

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