Bosch Rotak 43 LI Ergoflex Cordless

Bosch Rotak 43 LI Ergoflex Cordless Lawnmower

Bosch Rotak 43 LI Ergoflex Cordless Lawnmower

PRO’s: lightweight, excellent cut & cable free

CON’s: none that we can think of

VERDICT: for large gardens a truly viable alternative to a heavy petrol mower


TODAYS BEST PRICE: £1.13 from Amazon

Are cordless rechargeable lawn mowers a viable alternative to petrol lawnmowers ?  Bosch seem to think so with their Bosch Rotak LI range so is the daddy of the range, the 43 cm 17 inch Bosch Rotak 43 LI Ergoflex, really that good ?

We’ve used cordless electric lawn mowers in the past and have always been disappointed by them.  The earliest ones used lead acid batteries which were extremely heavy – the cordless models weighed more than their petrol equivalents – whilst the more recent ones used fussy Ni-Cad batteries which, if treated badly, lost their ability to hold their charge and were very expensive to replace.

But the widespread availability of Lithium-ion batteries in laptops and mobile phones has meant that a new breed of cordless electric lawn mower is now available.  Thanks to a much higher power density than previous types of rechargeable battery Li-Ion batteries can hold more power yet weigh far less.

With the Bosch Rotak 43 LI Ergoflex Bosch have taken the existing Bosch Rotak 43 Ergoflex lawn mower (which we rated 5 out of 5) and have removed the need for a mains cable with power instead coming from a single 36 V 2.6 Amp Hr Li-Ion battery.  A second one is supplied so that, as one is in use, the other one charges.

And that’s the beauty of the Bosch Rotak 43 LI Ergoflex, with run times on a single battery of around 25 minutes or so and each battery taking 30 minutes to reach 80% charged then it’s possible to alternate the batteries giving you almost continuous cutting.

Like all Bosch Rotak lawn mowers, this Bosch Rotak 43 LI Ergoflex arrives partly assembled but it doesn’t take long to assemble the handle and grassbox.  As the batteries are partly charged, you’ll need to put one on charge before you start assembly so that it’s topped up by the time you’ve finished putting the mower together.  We were cutting the grass within 25 minutes of unpacking the box whilst the second battery was on charge.

With the exception of the power source, the Bosch Rotak 43 LI Ergoflex is almost identical to it’s mains powered sibling.  It cuts fabulously well, picks up nearly all the cuttings, cuts extremely close to the lawn edge and walls thanks to the innovative grass combs and leaves a lovely stripe on the lawn thanks to it’s built-in roller.

We’re big fans of the Bosch Rotak 43 Ergoflex and the cordless version is just as good with one exception where it’s even better.  Because of the lack of the mains cable, it’s actually quicker to cut the grass with this mower because of the time saved by not having to keep flicking the mains cable out of the way.  Now each flick may only take a few seconds but in a large garden you’ll end up doing it hundreds of times.  And if you’ve got lots of trees, awkward shaped flower beds or ponds, the time saved by not having to thread the cable around them is considerable.

Like it’s mains powered sibling, the cutting height on the Bosch Rotak 43 LI Ergoflex can be adjusted in ten steps between 20 mm and 70 mm via a single lever, the 50 litre grass box holds a huge amount of grass but you still can’t see into it to see if it needs emptying – a niggle that we have with all Bosch Rotak mowers.

But in the case of the Bosch Rotak 43 LI Ergoflex it’s not really a problem because the mower will turn off when it’s full to let you know that it needs to be emptied.  It’s a pity that the mains powered versions don’t do the same.

So is the Bosch Rotak 43 LI Ergoflex really an alternative to a petrol lawn mower ?

We’d have to say a resounding YES !

With the Bosch Rotak 43 LI Ergoflex cordless mowers have come of age.  It’s lightweight – at a fraction under 14 kgs it’s half the weight of a petrol lawnmower – yet offers all the benefits.  It’s powerful, cable free yet quiet – no louder than a vacuum cleaner – but it doesn’t need expensive fuel to run nor expensive annual services and it can be used on slopes where petrol mowers can struggle due to fuel starvation.

Are there any downsides ?

Well, it does appear expensive until you work out the maths.  Whilst it costs about the same as a high-end petrol lawnmower to buy the running costs are much lower.

Each cut will cost around 5 pence in electricity compared to a pound or two of petrol.  There are no annual services which typically cost £100 or so and the batteries are good for 500-700 charge-discharge cycles which equates to around 10 years use.  Should they need to be replaced, then the batteries are available separately for around £90.

We love this mower.  It’s surprisingly sturdy, it’s lightweight and an absolute pleasure to use.  It cuts the grass beautifully and faster than the same sized mains powered electric mower.

The bottom line is: if you’ve got a big garden and don’t want a petrol lawnmower, this is the one !  Buy it !

Todays Latest Prices for Bosch Rotak 43 LI Ergoflex

Stockist Catalogue Product Name Price  
Amazon Bosch Rotak 43 LI Ergoflex £1.13 Visit Store
Machine Mart Machine Mart Xtra Bosch Rotak 43 1800W 43cm Electric Lawn Mower £175.00 Visit Store Bosch Rotak 43 Li Ergoflex Cordless Lawnmower £396.00 Visit Store
B and Q Not in stock when last checked
(Prices checked daily at 8 am & 1 pm)
N/A Check Now Not in stock when last checked
(Prices checked daily at 8 am & 1 pm)
N/A Check Now
Tooled Up Not in stock when last checked
(Prices checked daily at 8 am & 1 pm)
N/A Check Now
World Stores Not in stock when last checked
(Prices checked daily at 8 am & 1 pm)
N/A Check Now

We’re Social ….

Get the latest reviews, gardening tips and chat by following us on Facebook, Twitter or Google+