laptop batteries

I have been spoiled with a TRS Radio Shack Model 100 lap top.
It runs for twenty hours on four "AA".

Now my wife wants a lap top that runs Windows.

I saw a Toshiba lap top on sale at Best Buy today for $400.

The place with the most specs was Ebay.

It seems that bettery charge is expected to last 1.5 hours.
Is this typical of all lap tops?

Also read elswhere that Toshiba warranty is 90 days versus one year of
other companies. Are most other manufacuerers one year?

Please repy to NG.

Thanks

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