Keeping old battery in pismo or new battery when on the ac adapter?

I have a pismo that has a fairly new battery in it. Most of the time, I have the pismo plugged into an AC adapter.
I still have the old battery that has a little bit of charge left in it. Therefore, my question is this:
Should I leave the new battery in the pismo with the machine plugged into the wall? Or, should I charge the new battery until it is full and then take it out of the pismo and store it somewhere and put the old battery in the pismo while I have it connected to the AC adapter?
thanks in advance for any answers

First of all, the charge circuitry will never overcharge the battery no matter how long you keep your PowerBook's AC adapter plugged in.
Nevertheless frequent recharging of the battery will reduce its life. If this happens a lot on your machine (which can be told by the battery icon in the menu bar showing a lightning bolt instead of a plug) then swapping in the old battery while working on AC power for prolonged periods may help.
However, more recent batteries and/or power managers are a bit smarter. When running on AC power, they wait for the battery charge to drop to 95% and only then recharge to 100%. If yours works this way, then you don't need to worry about it too much.
It is much more important for any lithium ion battery to be 'trained' (i.e. discharged from 100% to 0% and then recharged back to 100%) about once a month in order to retain its health. See Apple's [battery page|http://www.apple.com/batteries>.

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