My4Sons M4 Agitator
The M4 with a built-in agitator, for anyone spraying powders or mixes that settle in the tank.
Amazon $299.99$299.99
The My4Sons M4 Agitator is the better battery backpack sprayer overall, rated 3.7 to 3.2. The My4Sons M4 Agitator leads on features. The EGO BSP3500 56V wins on spray power. The EGO BSP3500 56V costs $3.89 less ($296.10 vs $299.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
EGO BSP3500 56V
The most powerful battery backpack sprayer here, for owners of EGO 56V tools who need reach into trees and tall hedges.
Amazon $296.10$296.10
Which should you buy?
- Choose the My4Sons M4 Agitator for features (battery and charger included, adjustable pressure, 4 or more nozzles, metal wand, agitator vs adjustable pressure, 4 or more nozzles).
- Choose the EGO BSP3500 56V for spray power (up to 350 PSI vs up to 80 PSI).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4 gallons and up battery backpack sprayer; a clear win is highlighted. How we rank explains each one.
| Factor weight | My4Sons M4 Agitator | EGO BSP3500 56V |
|---|---|---|
| Overall rating | 3.7/5 | 3.2/5 |
| Value 25% | 30 $75 per gallon of tank ($299.99, 4 gal) | 31 $74.03 per gallon of tank ($296.10, 4 gal) |
| Tank size 10% | 67 4 gal tank | 67 4 gal tank |
| Spray power 20% | 71 up to 80 PSI | 100 up to 350 PSI |
| Runtime or airflow 20% | 100 50 tanks per charge (200 gal) | 0 runtime not published, scored as zero |
| Features 15% | 90 battery and charger included, adjustable pressure, 4 or more nozzles, metal wand, agitator | 35 adjustable pressure, 4 or more nozzles |
| Warranty 10% | 0 warranty not published, scored as none | 100 5-year warranty |
Specifications
| My4Sons M4 Agitator | EGO BSP3500 56V | |
|---|---|---|
| Spraying | ||
| Tank | 4 gal | 4 gal |
| Max pressure | 80 PSI | 350 PSI |
| Max flow | - | 0.6 GPM |
| Nozzles included | 9 | 4 |
| Wand length | 48 in | - |
| Hose length | 60 in | - |
| Power | ||
| Battery | 12 V 8 Ah, included | 56 V, sold separately |
| Runtime per charge | 6 hours | - |
| Gallons per charge | 200 gal | - |
| Tanks per charge | 50 | - |
| Features | ||
| Adjustable pressure | Yes | Yes |
| Metal wand | Yes | - |
| Agitator | Yes | No |
| Gauge or control panel | No | No |
| Build | ||
| Warranty | - | 5 years |