Q: Are jumper packs a good investment? The idea of jumping your car battery without having to find someone to help is very appealing, especially if you are on your own. Prices vary widely. Any thoughts or recommendations?
N.D. Hometown, Illinois
A: About the size of a small loaf of bread, those battery packs can be lifesavers. Also known as battery banks or power banks, they can not only jump-start a car, but recharge your smartphone and other devices. Look for one with a capacity of about 10,000 mAh and peak output about 1,000 amps. Like anything, you get what you pay for, but you can find many good units for under $100.
