EGO ST6703LB String Trimmer and Blower Combo review

A two-tool package with the stronger blower specification

The EGO ST6703LB pairs a 15-inch string trimmer with a 670 CFM handheld blower. Its package page names a 56V 4.0 Ah ARC Lithium battery and 210 W charger, and it lists both tapered and spread blower nozzles. That is a materially different box from the ST6151LB: the blower has a higher published maximum, the battery has a larger label capacity, and the extra nozzle broadens the ways the blower can be configured. It is a sensible comparison if you need both trimming and cleanup tools; it is poor value if the trimmer would stay unused.

The trimmer is described as a telescoping aluminum-shaft model with POWERLOAD line winding, dual spiral-twist .095-inch line and up to a 15-inch cutting swath. The blower is handheld, variable speed and fitted with a lock-on dial plus turbo control. EGO lists IPX4 weather resistance. That rating does not mean rain-safe storage, nor does it replace the manual’s battery and operating precautions.

The 670 CFM ceiling and two nozzle choices

EGO lists up to 670 CFM and 180 mph with the tapered nozzle attached. The linked LB6700-family manual specifies 160 mph without that nozzle and 180 mph with it, plus 21 newtons maximum blowing force. The speed dial provides a lower operating range before the turbo button calls for the full output. One feature block on the product page says 225–530 CFM, while the details and technical-spec list say 250–530 CFM. Because EGO’s own statements differ, treat the exact low-end dial range as unsettled rather than repeating one value as certain; the advertised 670 CFM turbo maximum is consistent across the page and manual.

The included tapered nozzle concentrates the stream, while the spread nozzle creates a broader outlet. These are attachments used one at a time, not separate blower modes that can be combined. The manual-listed 180 mph maximum belongs to the tapered setup, so it should not be assumed for the spread nozzle. A wider stream may be convenient for sweeping a surface, while the tapered tube is the more direct choice for a concentrated push. The separate tool’s performance still depends on debris, moisture and surface; a maximum CFM number is not a timed clearing result.

Pack, charger and the trimmer tradeoff

The kit has one 4.0 Ah battery, not two. EGO advertises up to 80 minutes of blower runtime on a single charge with that pack. The linked LB6700 manual lists approximate figures of 160 minutes on low, 24 on high and 13 in boost. The product-page estimate and the manual’s mode-specific values do not line up as a single simple promise, so plan around the task and setting rather than expecting the longest headline duration at maximum output. A 4 Ah pack gives more labeled capacity than the ST6151LB’s 2.5 Ah pack, but no complete battery-installed blower weight is published here. The manual’s 4.8-pound blower figure is body-only.

The included battery moves between the blower and trimmer; one pack cannot power both tools at once. EGO lists up to 80 minutes for blower use and its trimmer page describes a separate runtime estimate, but those figures should not be added into a guaranteed two-tool work session. The manual linked from the combo page covers the ST1510T trimmer family and lists a bump-feed head, .095-inch twisted line and a 15-inch cut; the current combo page also describes POWERLOAD line winding. The names refer to winding new line and feeding line during cutting, but check the actual kit instructions if head operation is central to your choice.

Compared with a blower-only purchase

Choose ST6703LB when you need the trimmer, the larger included pack and both nozzle shapes in the same order. The ST6151LB is the lighter-output alternative with one 2.5 Ah battery, standard charger and tapered nozzle only. If you already own a compatible trimmer, the standalone LB6703 blower kit may deliver the comparable 670 CFM blower class without bundling a second trimming tool; compare its precise package contents rather than assuming the combo suffix and blower-only suffix are interchangeable.

It may suit properties where a homeowner wants one battery platform for edge work and leaf cleanup, particularly when a spread nozzle is genuinely useful for broad sweeps. It is not automatically preferable for tiny, brief cleanups, and the higher maximum cannot prove faster work on every surface. Loose gravel, dry mulch and planting beds call for restraint; the dial is there to modulate output, not just to reach turbo. A buyer who needs an included shoulder strap or true backpack carrying system should look at other models; this package is a handheld blower with a trimmer, not a harness blower kit.

Bottom line

The ST6703LB is a broad homeowner combo: 670 CFM maximum blower, tapered and spread nozzles, one 4.0 Ah pack, a 210 W charger, and a telescoping 15-inch trimmer. Its practical case rests on needing the whole set, not on treating the largest number as a ranking. Confirm ST6703LB on the box, understand the manual-versus-page runtime and dial-range differences, and compare the blower-only LB6703 if trimming is already covered.