Cordless leaf blowers: CFM, MPH and battery life explained

Battery leaf blowers have become the default choice for many homeowners. They start with a trigger, need no fuel and are quieter than gas models. Choosing one is about airflow, battery life and noise.

CFM and MPH: you need both

Leaf blowers are rated with two airflow numbers:

• CFM (cubic feet per minute): the volume of air. High CFM moves large piles of leaves.
• MPH (miles per hour): the speed of air at the nozzle. High MPH lifts stuck-down, wet leaves and debris from cracks.

A blower with very high MPH but low CFM can blast a narrow stream but won't move piles well. One with high CFM but low MPH pushes dry leaves but struggles with wet, matted ones. Compare both.

Battery life on high

Runtime claims are often given on the lowest setting. On high or turbo, runtime can be much shorter. Practical tips:

• Use turbo only for stubborn spots.
• A second battery is the easiest way to finish a large yard.
• Higher amp-hour batteries run longer but add weight.

Battery platforms

Most brands' batteries only work with their own tools. If you already own a drill or mower on one platform, a blower on the same platform saves buying another charger and battery. If you're starting fresh, look at the range of yard tools on that platform.

Handheld vs. backpack

• Handheld blowers suit most suburban yards, decks and driveways.
• Backpack blowers carry larger batteries on your back, giving more power and runtime for big properties, and are easier on your arm.

Noise and local rules

Battery blowers are generally quieter than gas models, but they're still loud up close. Check the decibel rating if noise matters, and wear hearing protection for long sessions.

Some cities restrict leaf blower use by time of day or ban gas-powered blowers. California law requires most new small off-road engines sold from 2024 onward, including those in leaf blowers, to be zero-emission. Check your local rules.

Comfort and extras

• Weight and balance, with the battery fitted.
• Variable speed trigger and cruise control to avoid holding the trigger.
• Nozzle attachments: flat nozzles for concentrated airflow, round for general clearing.
• Vacuum/mulcher kits on some models, useful for small amounts of leaves.

Questions people ask

Is a cordless leaf blower strong enough?

For most homes, yes. Larger properties with heavy, wet leaves may need a backpack battery unit or extra batteries.

How long do leaf blower batteries last?

Runtime ranges from a few minutes on turbo to much longer on low. Battery lifespan in years depends on use and storage; keep batteries out of extreme heat and cold.

Can I use a leaf blower on wet leaves?

Yes, but you'll need higher air speed (MPH). Raking or mulching with a mower may be easier for heavy, wet piles.