Battery charges to about 83%

Hi
My iBook Dual-USB is displaying an odd behaviour. I had a battery aged around 2 years (around 350 charge cycles). It didn't charge anymore to 100% but when it reached 80-83% the 4 green LEDS started blinking together; eventually stopped blinking all together, but the colored ring around the adaptor port remained orange. When I turned on the Mac, the battery showed around 83% charge, never going any higher.
Si I decided to buy a new battery. First time round it charged to 95%, but it is now on its 4th charge cycle and is already displaying the same behaviour as the old battery.
Could it be my power adapter that's on the blink? I've tried resetting the Power Manager and PRAM but that doesn't solve anything.
If I need to buy a new adapter, is it OK to buy a 65W one or should it be 45W as the original one? My Apple Store only seems to sell the 65W model.
Cheers,
Kris

Thanks for your advice. I bought a new PowerBook G4 last month and tried the power adapter that came with it on my iBook, but nothing. It still loads to about 83%, then stops loading. The ring remains amber, tough the battery icon in the menu bar turns to "charged". It's a real mystery. The only thing that I can think of is that 83% is about 5/6 of 100%. So if the battery is a 6-cell one (what I presume) there something must be going wrong with charging the 6th cell... (sounds a bit like a murder mystery).

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Battery charges to about 83%

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