Bosch Rotak 37 LI Ergoflex

Bosch Rotak 37 LI Ergoflex cordless mower

Bosch Rotak 37 LI Ergoflex cordless mower

PRO’s: lightweight, cuts grass, collects cuttings, good battery life

CON’s: only one battery but it’s enough

VERDICT: outstanding cut, lightweight, leaves a nice stripe


TODAYS BEST PRICE: £378.35 from

With its 37 cm (14 inch) cutting width the Bosch Rotak 37 Ergoflex is already our top choice for a medium sized garden but does the more costly cordless version offer any significant benefits ?  Read on and find out !

Cordless mowers are more expensive than their non-cordless equivalents so this extra cost has to be weighed against any potential benefits.  With the conventional mains powered version, the Bosch Rotak 37 Ergoflex, costing around £150 and the cordless version costing around £350 there must be a fairly compelling reason to pay the extra £200.

Bosch make a range of cordless mowers from the biggest designed for large gardens – the Bosch Rotak 43 LI Ergoflex -down to the baby Bosch Rotak 32 LI Ergoflex for small gardens.   We’ve already looked at the  Bosch Rotak 43 LI Ergoflex and love it but is a cordless mower needed in medium sized gardens ?

The main of a cordless lawn mower is the lack of a power cable to get wrapped around obstacles in the garden and you don’t have to keep flicking out of the way.  If your garden is a simple rectangular shape then this may not be too much of a problem but if there are flower beds located within the lawns, or trees and shrubs, or the your garden is very long and needs several extension leads to provide power to the mower then a cordless lawn mower suddenly makes sense.

Electric cordless mowers are also significantly lighter than the equivalent sized petrol lawn mower too, so if you’re struggling with a heavy petrol mower or have lawns over several levels then the reduced weight of a cordless mower (around 11 kg compared to the 25+ kg of a petrol mower) will help prevent back ache and strained muscles from lugging it around.

And that’s the main selling point of the Bosch Rotak 37 LI Ergoflex.  It’s cable free and light yet gives an excellent finish and picks up all the cuttings.

Like the cheaper mains powered version we reviewed previously, the Bosch Rotak 37 LI has the same inset front wheels and grass combs which really do work to pull the grass under the cutting deck ensuring that you can cut right up to the edge of flower beds, walls and fences.

And thanks to the integrated rear roller it also leaves a pleasant stripe behind on the lawn.

It also has the same cutting height adjustment system which offers ten distinct cutting heights between 20 mm and 70 mm and it shares the same Ergoflex handles which offer eight different hand positions.

The same 40 litre grass box is also included which – like on the regular version – we feel is a little smaller than it should be but, and here is where the cordless and mains powered versions differ, the cordless version stops automatically when it’s full so the fact that you can’t see into isn’t a problem.

All of these features mean that the Bosch Rotak 37 LI Ergoflex is just as good as the mains powered alternative.

Unlike the larger the Bosch 43 LI Ergoflex, the Bosch Rotak 37 LI Ergoflex comes with just one Lithium-Ion battery which gives a runtime of around 25 minutes.  It takes around the same to recharge to 80% full or an hour to recharge fully.

We found that, for a medium-sized garden of around 120 square metres, we could cut the grass on full charge although if the grass hadn’t been cut for a week or two then we’d run out of charge just before the end as the mower had to work that little bit harder.  However, there’s always another job to do in the garden and within 20 minutes or so the battery had enough charge to finish off the lawn.

It’s a shame that, like its big brother, the Bosch Rotak 37 LI Ergoflex doesn’t come with a spare battery but then that would add significantly to the cost.  They are available separately though for around £90.

So, would we buy the Bosch Rotak 37 LI Ergoflex ?

Definitely – it’s light in weight, has enough power to cut 120 square metres of grass and recharges quickly should the battery not last the course.  Although it seems expensive compared to the mains powered version the convenience of not having to drag a cable around obstacles in the garden added to the fact that a similarly-sized petrol mower would cost around the same amount to buy but would need expensive annual services make teh maths add up.

Todays Latest Prices for Bosch Rotak 37 LI Ergoflex

Stockist Catalogue Product Name Price Bosch Rotak 37 Li Ergoflex Cordless Lawnmower £378.35 Visit Store
Machine Mart Machine Mart Xtra Bosch Rotak 37 Li 36V Cordless 37cm Electric Lawn Mower £385.00 Visit Store
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