Higher capacity replacement battery?

Firstly I'm very dissapointed that I am having to purchase a new battery but my current one barely lasts for 20 minutes. I have recalibrated and also downloaded coconutBattery to find out the loadcycle and current capacity. They read as 236 loadcycles and a current capacity of 553mAh (it was 4200mAh when new!). Now Apple says that it should continue to run at around 80% of it's original power after 300 cycles but that's simply not true!
Anyway, enough moaning. I need to purchase a new battery and wondered if there were any batteries that offered a greater capacity than the original 4200mAh? If so, where can I get hold of one (preferably in the UK)
PowerBook G4 1gig / 1.25G RAM   Mac OS X (10.4.7)   120gb WD Scorpio Drive

Now Apple says that it should continue to run
at around 80% of it's original power after 300 cycles
but that's simply not true!
You left out an important point that Apple makes, which is thtat a properly maintained battery should retain 80% capacity after 300 charge/discharge cycles. For example, if someone left the PB plugged in all the time, and didn't deep discharge the battery at least once a month, they wouldn't get the 80% capacity after 300 cycles. Not saying that you did that, only that there's an important qualification on that Apple statement.
If I was going to consider a non-Apple battery, I'd look at the battery sold by OWC which others have already mentioned, at http://eshop.macsales.com/shop/powerbook/battery/g4-12inch-aluminum/
Another source for a replacement is duracell direct. I have no experience with their replacement, however, they have free shipping and a 10% off coupon shown at the top of the web page at http://www.duracelldirect.com/applepowerbook-g4-12_batteries_laptopb-5904.aspx

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