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Milwaukee M18 String Trimmer 2725-21HD Tips & Review

Not an Average 18 volt String Trimmer

It is the middle of winter here in Michigan and we are testing out the Milwaukee M18 String Trimmer with the new 9.0Ah battery.  Lucky for us and those who want to know exactly how this unit performs, we have grass to cut!  The Milwaukee M18 String Trimmer is a straight shaft trimmer with the motor located back by the battery and a shaft that drives the gear box by the trimmer head.  The design is proven with many gas string trimmer models and a few other battery operated string trimmers.  One item we like about this design is the ability to add grease to the trimmer head for longer life of the unit.

The Milwaukee M18 String Trimmer has some very awesome qualities and a few that we feel could be improved.  Let’s start with a few awesome qualities.  First the string trimmer is very balanced with the 9.0Ah battery and it is not too light, but also not too heavy.  The straight shaft is solid and feels very sturdy.  The variable speed trigger works well and there is virtually no lag in the motor when starting it up.  If you burp the trigger while the unit is running, there is a slight lag, but that is hardly worth mentioning.  Power exceeds what we have seen from all other 18 volt string trimmers on the market.  The guard located by the head is small, but effective.  On the guard is the string cutter that will come from the factory in the 14″ swath configuration.  Remove the two bolts and flip it around to take advantage of the 16″ swath cut.  Milwaukee created a very nice string trimmer that anyone with an acre of land or less would enjoy and finish their trimming on one charge.

Now for the few items that we feel would improve this string trimmer.  Milwaukee added a computer controlled high and low to the string trimmer.  That in itself is not bad as it does allow the user to conserve battery as it limits the RPMs to 4,600.  Unfortunately, the switch is a push button with an LED light.  We feel that over time this button will be full of grass and dirt.  While the button might last, we feel this would have been a great place for a larger sliding switch.  (WORKSHOP ADDICT MOD: We would label the switch with one side that says MANLY MODE and the other side says MEH.)  We are not fans of the low setting on string trimmers as we feel that is what a variable speed trigger is for.  Second, the string that is shipped with the string trimmer is weak at best.  We changed it out for a quality .095 line right off the bat.  A good .080 would work very well for a quality lawn cut.  Changing the line is not hard, but there are a lot of great methods available and we are surprised Milwaukee did not take a different route with string loading.


Cutting Swath   14″ – 16″
Voltage   18V
Line Diameter   0.080″ / 0.095″
Feed System   Bump Feed
Length   70.6″
Weight   9.9 Lbs
Height   8.5″
Width   8.8″


The Milwaukee M18 Fuel String Trimmer will surprise you when it comes to power and runtime.  Milwaukee states it will get up to an hour runtime on the box and we feel that would be on low feathering the trigger.  In our heavy duty use testing, we averaged 21 minutes of runtime off the 9.0Ah battery.  The low was 14 minutes and the high was 33 minutes.  Take into consideration that a lot of our testing was in our woods with weeds and longer grass.  We feel that one could easily take care of a one acre yard with the runtime this string trimmer supplies.  The bonus to what Milwaukee Tool created in outdoor power equipment is the M18 battery.  If you are using other Milwaukee tools, the 9.0Ah battery will help you with longer runtime on other tools.

This is an outdoor power equipment tool from Milwaukee that we would highly recommend.  Watch our YouTube video to see us change the string to a better quality and how to maintenance the unit after 50 hours.

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