EGO Power+ 15" POWERLOAD String Trimmer (ST1521S) Review (2026)
By Nate Sawyer, Editor · Updated July 2026
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- Small yards
- Medium yards
- Battery
- Edging
- Low maintenance
Per specs and owner reviews, EGO's ST1521S is a 15-inch 56V string trimmer whose POWERLOAD head auto-winds line to skip messy hand-feeding, a quiet, low-maintenance pick for suburban yards and edging. The ~45-minute runtime can fall short on large lots, and it uses .095-inch line, not gas-grade line. Wear eye protection.
Pros
- POWERLOAD head reloads line automatically, skipping the usual messy hand-winding
- Carbon-fiber straight shaft plus brushless motor is quiet, low-vibration, and starts instantly
- Shares one 56V battery platform with EGO blowers, mowers, and edger attachments
Cons
- 2.5Ah runtime (~45 min) can fall short on large lots without a spare pack
- Kit price runs higher than a comparable gas trimmer up front
- Bump/auto head still relies on pre-cut .095 in line, not thicker gas-grade line for heavy brush
Specifications
| Power | 56V ARC Lithium battery |
|---|---|
| Swath | 15 in |
| Line feed | POWERLOAD auto-wind (bump-style .095 in) |
| Runtime | ~45 min (2.5Ah) |
| Weight | ~9.9 lb |
| Best for | Small to medium yards & edging |
Frequently Asked Questions
- What does POWERLOAD do?
- It winds new trimmer line automatically — you feed the line through and press a button instead of hand-winding a spool. It removes the single most disliked maintenance task on a string trimmer.
- Can it use heavy brush-cutting line?
- No. The bump/auto head relies on pre-cut .095 in line rather than the thicker gas-grade line used for heavy brush, so it is matched to grass and edging rather than clearing overgrowth.
- How does it feel to use?
- Light and quiet — about 9.9 lb with a carbon-fiber straight shaft and a brushless motor that starts instantly and vibrates little. Runtime is the constraint at roughly 45 minutes on a 2.5Ah pack.