Our verdict
The cheapest way into a cordless Flymo for under-200m² lawns. The brushed motor and Flymo-only battery mean this is an end-of-life-disposable rather than a platform buy. For a flat patch near a courtyard, it does the job at £169.
Pros & cons
Pros
- £169 with battery and charger
- 12kg — easy to manoeuvre
- Flymo brand recognition
- 30cm cut suits tiny urban lawns
Cons
- Brushed motor is older tech than premium rivals
- 30cm cut narrow for anything above 250m²
- Battery is Flymo-specific (not Husqvarna cross-compatible)
- Plastic deck
Full specs
| Type | Cordless |
|---|---|
| Cut width | 30 cm |
| Engine / Power | Flymo 40V brushed |
| Weight | 12 kg |
| Deck | Plastic |
| Self-propelled | No |
| Rear roller | No |
| Mulching | No |
| Cutting heights | 6 positions |
| Bag capacity | 30 L |
| Suited to lawn | Small |
| Noise level | 75 dB |
Buying second-hand
£35-70 used. Always check battery holds at least 15 minutes runtime; Flymo Mighti-Mo batteries are £45 to replace and only available direct. The grass box is a known wear part — cracked tabs are common. Avoid examples with deck dents from kerbs.
Where to buy the Flymo Mighti-Mo 300 Li
We don't take affiliate commissions. These are direct retailer searches you'd type into Google anyway.
External links open in a new tab. We don't track clicks or take commission. Prices and availability change — verify on the retailer site before buying.
Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 30cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Replacement battery
Wear part — typical 3–5 years to 80% capacity. The biggest single repair cost on any battery mower.
|
£90–£180 | £55–£120 |
Fair-offer calculator
Tell us about a specific used listing for the Flymo Mighti-Mo 300 Li you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
Owned a Flymo Mighti-Mo 300 Li?
Send us a one-line tip — what broke, what worked, what you'd buy next time. We curate and publish under your verdict (with credit if you want).
Send a tip →Weekly mower-watcher email — launching 2026
Five interesting Marketplace listings, one engine spotlight, one deal alert when a model drops at a major UK retailer. Join the waitlist and we'll email you the first issue when it launches.
No affiliate links. No upsells. Unsubscribe anytime in one click.