Important Safety Instructions
When using an electrical appliance, basic precautions should always be observed, including the following:
- Read all instructions before using this vacuum cleaner.
- Always unplug the charger from the electrical outlet before cleaning or performing maintenance.
- Do not use outdoors or on wet surfaces.
- Do not allow to be used as a toy. Close attention is necessary when used by or near children.
- Use only as described in this manual. Use only manufacturer's recommended attachments.
- Do not use with damaged cord or plug. If appliance is not working as it should, has been dropped, damaged, left outdoors, or dropped into water, return it to a service center.
- Do not pull or carry by cord, use cord as a handle, close a door on cord, or pull cord around sharp edges or corners. Do not run appliance over cord. Keep cord away from heated surfaces.
- Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.
- Do not handle plug or appliance with wet hands.
- Do not put any object into openings. Do not use with any opening blocked; keep free of dust, lint, hair, and anything that may reduce air flow.
- Keep hair, loose clothing, fingers, and all parts of body away from openings and moving parts.
- Turn off all controls before unplugging.
- Use extra care when cleaning on stairs.
- Do not use to pick up flammable or combustible liquids, such as gasoline, or use in areas where they may be present.
- Do not pick up anything that is burning or smoking, such as cigarettes, matches, or hot ashes.
- Do not use without dust cup and/or filters in place.
- Prevent unintentional starting. Ensure the switch is in the off-position before connecting to battery pack, picking up or carrying the appliance.
What's in the Box
The Shark EvoPower System IQ Cordless Vacuum (Model CS851SMBR) includes the following components:
- Cordless Vacuum Stick
- Charging Dock
- Accessory Kit
- Crevice Tool
- Lithium-ion Battery
- Owner's Guide
Note: Some models may include additional accessories such as a Charging Auto Empty Dock, Baby Dock for Accessories, Motorized Hand Tool, Pet Multi Tool, or Wide Upholstery Tool. Please refer to your specific product packaging for exact contents.

Image: All components of the Shark EvoPower System IQ vacuum, including the main unit, charging dock, and various cleaning tools.
Assembly
The Shark EvoPower System IQ is designed for easy assembly. Follow these steps to set up your vacuum:
- Connect the Wand: Insert the wand into the main handheld vacuum unit until it clicks securely into place.
- Attach the Floor Nozzle: Connect the desired floor nozzle (e.g., HybridClean floorhead) to the bottom of the wand, ensuring it clicks firmly.
- Insert Battery: Slide the lithium-ion battery into the battery slot on the main unit until it locks.

Image: Fully assembled Shark EvoPower System IQ cordless vacuum in its upright position.
Charging the Battery
Before first use, fully charge the battery. A full charge typically takes approximately 4 hours.
- Connect Charger: Plug the charging adapter into a wall outlet.
- Place on Dock: Place the vacuum onto the charging dock. Ensure the charging contacts align. The battery indicator lights will illuminate to show charging status.
- Direct Charging: Alternatively, the battery can be removed and charged directly using the charging adapter.
Operating Modes and Smart iQ PRO Technology
The Shark EvoPower System IQ features intelligent suction technology to optimize cleaning performance across various surfaces.
- Smart iQ PRO Technology: This feature automatically detects the dirt level and flooring type, adjusting suction power as needed for efficient cleaning.
- Auto Dirt Detect: The vacuum intuitively senses hidden dirt and automatically boosts suction power to ensure thorough pickup.
Available Modes:
- Power Mode / Deep Clean Mode: Provides maximum suction for intensive cleaning tasks and heavily soiled areas.
- ECO Mode: Designed for energy saving and lighter cleaning, extending battery run-time.
- Boost Mode: Offers a temporary surge of extra power for stubborn debris.

Image: Illustration of the Smart iQ Indicator, showing how the vacuum detects dirt levels (Low, Moderate, High) and adjusts suction power accordingly, with corresponding handheld and floorhead readouts.
Cleaning Attachments
The Shark EvoPower System IQ comes with versatile attachments to tackle various cleaning needs:
- HybridClean Multi-Surface Floorhead: Features a combination of soft brush for hard floors and flexible silicon fins for carpets, eliminating the need to switch floorheads. This design helps prevent hair tangles.
- Crevice Tool: Ideal for reaching tight spaces, corners, and edges.
- Accessory Kit: May include additional tools such as a Motorized Hand Tool, Pet Multi Tool, or Wide Upholstery Tool for specialized cleaning tasks.

Image: Close-up of the HybridClean floorhead demonstrating its anti-hair wrap technology, showing how it prevents hair tangles compared to other brushrolls.

Image: The vacuum's floorhead with Dual LED Lights illuminating a dark area, highlighting its ability to reveal hidden dirt.
Maintenance
Regular maintenance ensures optimal performance of your Shark EvoPower System IQ vacuum.
Emptying the Dust Cup:
Empty the dust cup after each use or when debris reaches the MAX fill line. To empty, hold the dust cup over a trash bin and press the release latch.
Cleaning Filters:
Rinse the pre-motor filters (foam and felt) with cold water at least once a month. Tap loose dirt off filters between washes as needed. Allow filters to air-dry completely for at least 24 hours before reinstalling. Do not operate the vacuum without filters in place.
Cleaning Brushrolls:
Periodically check the brushroll for any hair, string, or debris that may be wrapped around it. Use scissors to carefully cut away any tangled material. The HybridClean brushroll is designed to minimize hair wrap, but occasional inspection is recommended.
Troubleshooting
If your Shark EvoPower System IQ is not performing as expected, refer to the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Vacuum not turning on. | Battery not charged or not properly inserted. | Ensure battery is fully charged and securely clicked into place. |
| Low suction power. | Dust cup full, filters clogged, or blockage in nozzle/hose. | Empty dust cup. Clean filters. Check for and remove any blockages. |
| Brushroll not spinning. | Obstruction in brushroll or incorrect floor setting. | Remove any debris from brushroll. Ensure correct floor setting is selected. |
| Battery life is short. | Using Boost mode frequently or battery degradation. | Use ECO mode for longer run-time. If battery life significantly decreases, consider battery replacement. |
Specifications
| Feature | Detail |
|---|---|
| Brand | Shark |
| Model | CS851SMBR |
| Item Weight | 2 Kilograms |
| Form Factor | Stick |
| Power Source | Corded Electric (for charging) |
| Voltage | 225 Volts |
| Is it Cordless? | Yes |
| Batteries Required | Yes |
| Filter Type | Cartridge |
| Surface Recommendation | Carpet, Hard Floor |
| Special Features | Cordless, Auto Dirt Detect, Strong Suction Power, Ultralight at 2kg |
| Bin Capacity | 0.14 Liters |

Image: A person using the ultralight Shark EvoPower System IQ vacuum in a modern kitchen setting, demonstrating its ease of maneuverability.
Warranty and Support
For warranty information, product registration, or technical support, please refer to the official Shark website or contact their customer service. Keep your purchase receipt as proof of purchase for warranty claims.
Visit the official SharkClean website for more details and to access additional resources.





