The great thing about a laptop computer is that you can take it anywhere. You can write letters on the beach, or review company spreadsheets while you're waiting for your plane to board at the airport. But laptops live on batteries, and sooner or later, whether it's a Toshiba, HP, Compaq, Dell, Acer or Sony and even whether it's a PC or a Mac, it's going to need a new battery.
That's why the laptop batteries and ac adaptors website is such a good deal. You can purchase anything from replacement CD-ROMS to spare bulbs for your projector. For example, here is their Replacement Projector Lamp for OPTOMA TS400, OPTOMA TX700.
It's highly recommended for anyone with a laptop computer.