When shopping for a cordless vacuum, Shark often comes up as one of the most reliable choices. Today, we compare the Shark IZ201 and Shark IZ251 (TruePet series) in detail. Both models feature Shark’s famous Flexology folding wand, Anti Hair Wrap technology, and LED headlights, but they target slightly different users. More importantly, since both vacuums run on removable batteries, investing in a replacement battery can greatly extend their long-term value.
Quick Comparison
| Feature | Shark IZ201 | Shark IZ251 (TruePet / Multi-Battery) |
|---|---|---|
| Positioning | Mid-range cordless vacuum; single battery; best for daily cleaning | Upgraded version; dual/triple battery options; TruePet attachments; large households |
| Weight | ~2.2 kg | ~4.1 kg with battery and accessories |
| Dustbin Capacity | ~1.0 L | ~0.7 L |
| Runtime | ~40 minutes | ~80–120 minutes (depending on dual or triple battery) |
| Noise | ~85 dB | ~78–80 dB in standard mode |
| Cleaning Strength | Great on hard floors & low/medium pile carpet | Stronger suction + TruePet tool for pet hair |
| Cost | More affordable (~£349 RRP) | More expensive due to extra batteries & tools |
Strengths and Weaknesses
Shark IZ201 Pros:
- Affordable, strong value-for-money cordless vacuum.
- Lightweight, easy to maneuver around furniture.
- Flexology design allows folding for storage and under-furniture cleaning.
- Anti Hair Wrap brush reduces hair tangles.
Shark IZ201 Cons:
- Limited runtime (~40 minutes, drops in Boost mode).
- Less powerful for deep-pile carpets.
- Long cleaning sessions may require recharging.
Shark IZ251 Pros:
- Dual/Triple battery system allows 80–120 minutes runtime.
- TruePet tool designed for pet hair removal.
- Powerful suction with DuoClean rollers.
- Excellent for large homes or multi-room cleaning.
Shark IZ251 Cons:
- Higher price tag.
- Heavier, less comfortable for long hand-held use.
- Large size means slightly harder to store.
Key Features Explained
- Flexology Wand: A bendable tube that makes cleaning under sofas, beds, and low furniture easier.
- Anti Hair Wrap Technology: Prevents most hair from wrapping around the brush roller.
- DuoClean Brush Head: Soft + bristle rollers combine for seamless transition between hard floors and carpets.
- Multi-Battery System: The removable battery design means you can swap batteries mid-cleaning for longer runtime. Investing in a Shark IZ201/IZ251 replacement battery ensures your vacuum keeps running like new.
Best For…
- Shark IZ201: Perfect for small to medium homes, apartments, and budget-conscious buyers who mainly clean hard floors and short carpets.
- Shark IZ251 (TruePet): Ideal for large households, pet owners, and anyone who needs extended runtime without interruptions.
Why a Replacement Battery Matters
One of the biggest advantages of both the Shark IZ201 and IZ251 is their removable battery system. Over time, cordless vacuum batteries naturally lose capacity. Instead of replacing the entire vacuum, simply upgrading with a replacement Shark vacuum battery restores performance and extends the lifespan of your machine.
Benefits of a Shark Replacement Battery:
- Extends runtime for larger cleaning sessions.
- Saves money compared to buying a brand-new vacuum.
- Keeps performance consistent over years of use.
If you own multiple batteries, you can also charge one while using the other – especially useful for IZ251 dual-battery owners.
Final Verdict
- Choose Shark IZ201 if you live in a small to medium-sized home, want a lightweight vacuum, and need solid performance at a good price.
- Choose Shark IZ251 (TruePet / Multi-Battery) if you need longer runtime, stronger suction, and better tools for tackling pet hair and bigger houses.
In either case, investing in a Shark IZ201/IZ251 replacement battery is the smartest way to protect your investment, ensure long-term cleaning power, and maximize the convenience of cordless vacuuming.