1.   And buy something from the immigrants who spend their days and nights walking through subway cars, peddling pens, trinkets and AA batteries.

2.   And instead of a replaceable AA battery, the PageWriter sports a rechargeable power pack that fuels up from a desktop cradle.

3.   Be sure to buy four AA batteries, though.

4.   Best of all, it runs on only one AA battery.

5.   A Canadian-built unit that hooks to my belt weighs only four ounces, including a durable AA battery.

6.   But many computers use regular AA batteries.

7.   Each device uses three AA batteries.

8.   Figuring out how to replace the AA battery is a challenge, so do it before dark.

9.   Five AA batteries supply the power.

10.   First I took a spin with the Swiffer WetJet, a mighty model that dispenses its liquid with a motorized squirter powered by four AA batteries.