Currently Being ModeratedNov 14, 2012 12:47 AM (in response to Buranko)
Like any laptop computer, it's more than fine with having the power adapter plugged in while a battery is attached.
In the case of your PowerBoook, it wont charge a fully charged battery while you have your power adapter plugged in. This goes for faulty old batteries too.
As for a replacement batteries. Apple don't make PowerBook batteries anymore. There are vendors out there selling old stock of new original Apple batteries. Not sure what the quality will be like on old stock. It's very debatable in regards to the Apple logo on a battery. I've known cheap China makes with authentic Apple logos on them. You're best to buy either a good quality third party battery from a reputable dealer or find an Apple authorized repair center who may carry good stock of quality batteries.
You can select an authorized repair center here: https://locate.apple.com/country
There maybe repair center willing to order and supply you a replacement battery.
Stay clear of really cheap counter part batteries, they don't last too long
Best of luck.
Currently Being ModeratedNov 14, 2012 9:13 AM (in response to Buranko)
I have a 12" G4 PB and have replaced bad batteries with Newer Technology NuPower batteries. I have had good luck with these so you may want to investigate.
Currently Being ModeratedNov 15, 2012 4:08 PM (in response to Knucklesmac)
It's unfortunate to know that Apple discontinued producing Powerbook G4 original battery but thank you for the help
Currently Being ModeratedNov 15, 2012 4:21 PM (in response to dalstott)
Thank you for the recommendation. As for now, I'm still investigating good battery for my powerbook. If I find your recommendation is the best one then I will surely choose it. By the way, does the battery really fit the battery place on Powerbook G4 12"? I mean, there's some case that some replacement batteries, which are produced by nonoriginal manufacture, don't really fit the battery place on notebooks. (even though they still works)
Currently Being ModeratedNov 15, 2012 6:57 PM (in response to Buranko)
These G4 batteries fit like the originals. I know what you mean about some not being accurate as I have had difficulty like that in the past.