Super NiCad batteries are rated at 1500 mAh and NiMH at 1900 mAh.
It's unlikely any newer technology will show up. Certainly Lithium-Ion is out of the question without a redesign of the internal charger.
There are lots of companies that may third party laptop and notebook batteries. A good starting place is a Yahoo search for something like notebook batteries or notebook batteries.
Xtend Micro Products has a nice Notebook battery FAQ that explains the differences between the various battery technologies.
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