Put New 10ah 20volts Battery Into My Lawnmower Ran 5 Feet Red Battery Light Blin

The batteries may not be fully charged. Try charging the batteries for a few hours and then try using the lawnmower again.

The batteries may be defective. If you have tried charging the batteries and the problem persists, you may need to replace the batteries.

There may be a problem with the lawnmower itself. If you have tried using different batteries and the problem persists, you may need to take the lawnmower to a service center for diagnosis.

Here are some additional things you can try:

Make sure that the batteries are inserted correctly in the lawnmower.

Check the battery terminals for corrosion. If the terminals are corroded, clean them with a wire brush.

Try using a different set of batteries.

If you have a multimeter, you can check the voltage of the batteries. The batteries should have at least 10.8 volts each.

If you have tried all of these things and the problem persists, you may need to contact DeWalt customer support for assistance.

Here are some additional tips to prevent this problem in the future:

Always use fully charged batteries in your lawnmower.

Avoid using batteries that are damaged or defective.

Inspect the battery terminals regularly for corrosion and clean them as needed.

Store the batteries in a cool, dry place.

I hope this helps!