The Dell Inspiron 9300 takes DDR2 PC2-5300 SODIMMs. It has two slots, each of which can hold up to 1GB, for a total of 2GB. This memory should work in your laptop with no issues, however, for performance issues, it is recommended to have the same memory size and type installed in each slot.
A105's ask for PC2-4200-533 SODIMM SRAM which is specific to the motherboard. That's your only option, although PC2-5300 is suppose to be backwards compatible with 4200 and 3200, it doesn't work with early models of A105 apparently.
There are a number of retailers from whom an Inspiron 9300 battery can be purchased. These include Laptop Town, Batt Depot and Amazon along with many more.
The Inspiron 9300 laptop with Windows 7 is a great device. Your best and most affordable option is to upgrade the drivers. This way you can have the best of the best without having to buy a new computer.
The Inspiron 9300 is faster than the HP 6000 from the reviews I could find. They both are good computers. But from what I am reading in your question you are looking for speed in your computer. You made a good decision.
As far as I can tell the Dell Inspiron 9300 laptop comes only in one color, off white with a bright white bumper along the outside. There are several laptop "lids" for sale, though, that change appearance.
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The Blackberry Curve 9300 is much better than the 8520 because the 9300 has a faster processor and Internet connection as the 8520 doesn't, but the 8520 is much cheaper than the 9300 but i recommend the 9300.
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