HP Compaq 6715s laptop won't boot on battery after BIOS update

Hello!
I got this laptop on Ebay. The power controller was not working. Then I got it replaced with another, from a deffective motherboard. The laptop performed very well afterward.
And then I downloaded the latest BIOS version from the HP support page. Flashing went OK, but now it wont boot on battery anymore. The initial boot screen shows, the power light flashes in amber color a few times and the machine shuts down.
With the charger connected to the laptop everything is well. If I boot on with charger connected and later disconnect it is OK too.
Please, advice me what should I do.

what type of your laptop?
BIOS recovery way that has been updated failed
1. download bios start, then extract with winrar or winzip.
2. initials instead of one file (depending on the type of your laptop)
3. save the file by using the flash disc (which has been in the FAT format)
4. dis boot with a flash in the following manner:
      a. off laptop batteries
      b. jack flash disc
      c. Do not plug the power cable
      c. press tobol (window + B) hold, while plug the power cord and turn on the laptop
5. akn laptop turns on and lights will flash 2x flash disc, the laptop will be read and will die, and came back on, and die back, and terkhir restarts with BIOS recovery.
hopefully can help

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