Not Turning On Beeping Noice And Led S Are Green And Red Olympus Camera C5000 Zoom

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Hi all my olympus C5000 zoom is not turning on I fixed some cold solder joint on the pcb but still the same error it looks like that the battery is losing power. I bought a new one but still the same problem what could be the problem it works sometimes and then I can make the best photos but later then its the ame problem any idea or a service manual? thank you for you help

https://youtu.be/Gyj0v1Z0L1w there is the YouTube libk with the error Battery is New and full Thank you