Black Decker CLM3820L2 Cordless Lawn Mower (38cm, Orange, 2 Batteries)

How long do the batteries last and how long do they take to charge?

Each 36V lithium battery provides approximately 20 minutes of cutting time, giving you 40 minutes total with both batteries. Charging takes about one hour per battery. The batteries feature LED charge indicators showing their current charge level. They hold their charge well between uses and should be stored indoors in winter rather than in cold sheds or garages.

What size garden is this mower suitable for?

This mower is designed for gardens up to 600m². With the 38cm cutting width and dual battery system, you can typically complete lawns of this size on a single charge cycle. For larger gardens, you may need to recharge batteries mid-session or consider purchasing additional batteries to extend your cutting time.

Can it handle wet or long grass effectively?

Yes, the high torque motor maintains performance in damp conditions and longer grass. However, for wet grass, it's recommended to use cutting height setting 2 or above to prevent clogging. The motor has built-in protection that may cause it to stop briefly if overloaded, but it will restart after a couple of minutes once cooled.

How easy is it to adjust the cutting height?

Very easy - a single lever adjusts all four wheels simultaneously across six positions from 30mm to 80mm. This eliminates the need to adjust each wheel individually, making height changes quick and convenient. The range covers most grass types from close-cut lawns to longer wildlife-friendly areas.

Is assembly required and how difficult is it?

Minimal assembly is required and most users complete setup within 10 minutes. The grass collection box can be slightly tricky to assemble initially, so following the instructions carefully is important. The handle unfolds easily and all major components come pre-assembled. No tools are typically required for basic setup.

How does the grass collection system work?

The 35L collection box features a plastic flap indicator on top that lifts with airflow when there's space inside and drops when full. This prevents overfilling and maintains optimal cutting performance. The box is easy to remove and empty, with a sturdy design that handles both dry and slightly damp clippings effectively.

Are the batteries compatible with other Black Decker tools?

Yes, the 36V batteries work with other Black Decker 36V garden tools including strimmers, hedge cutters and chainsaws. This makes the system cost-effective if you have multiple cordless tools. Note that smaller Black Decker tools may use different battery sizes, so check compatibility before purchasing additional tools.

How much does it weigh and is it easy to manoeuvre?

The mower weighs 16.2kg, making it significantly lighter than petrol equivalents whilst still feeling substantial and well-built. The integrated carry handle is positioned at the centre of gravity for easy lifting. Large rear wheels help with manoeuvrability on uneven terrain, though it may require some practice around tight corners due to its size.