Aventon Pace 500.3 Cruiser e-bikes with free extra battery at $1,599 (120-mile range), Anker PowerCore Reserve $90, Worx tools from $100, more ...

If your iPhone battery gets low, it's great to have a backup. Check out the best power banks, as tested by our CNET tech experts. Executive Editor David Carnoy has been a leading member of CNET's ...

Keeping them between 85% and 25% full can make them last up to 50% longer, but of course, you want your portable battery charger at 100%. Slow charging and discharging also help a lot—again ...

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