Battery energy consumed although connected to power

Recently I noticed that the power connector turned from green to yellow while I was working on my good old Powerbook.
I examined what was going on and here is what happens:
When the Powerbook is disconnected from power and reconnected to it a little later with the battery charge above 95% it consumes power from the battery. The charger LED is green, but the charge is going down (as if there was no power connected). Once the charge is lower than 95% the power connector turns yellow and the battery is charged. When charging is completed, there is no more power consumption from the battery.
This strange behaviour only happens when the Powerbook is turned on or after waking up from sleep mode. If the machine is shut down and turned on again, everything is as it should be (no battery energy is consumed).
I am not sure but I think this has started after the 10.5.6 update.
I tried with a second battery - same effect.
And of course I performed a PMU reset.
This behaviour is a battery killer so I hope to learn what I could try.
Any suggestions?

Hi, LC Vie. Your Powerbook is operating normally. It has always worked this way — it didn't just begin. Nothing is killing your battery.
When the Powerbook's battery is fully charged, it stops charging automatically, even if the AC adapter remains connected. The battery, like any battery, gradually loses charge whenever it's not being charged, even if the Powerbook is drawing its power from the AC adapter. When the charge level drops below 95%, charging automatically begins again, and continues until the battery is fully charged. The charging system is designed to operate this way in order to spare the battery from being trickle-charged (and heated) even when it's nearly full. Heat is an enemy to batteries. If your battery were to be charged constantly the entire time it's connected to AC power, it would be hot all the time, and its useful lifespan would be drastically diminished.

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