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I have a Sony Vaio PCG-K33P for about 3yrs now. The battery life of the original battery is wearing out. Tried several new batteries with the same result.

Once the new battery is fully charged and I start using it. The system thinks it is still on AC Power. Once the battery charge dies, the system will not charge the new battery.

Not sure if this is a BIOS issue, Bad Daughter Board Issue.

Any help or suggestions would be appreciated.