Bosch Rotak 37 LI
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After using a petrol lawn mower for years I thought I'd give the battery Bosch lawn mower a try after a friend recommended it to me. It's fantastic lawn mower. No need for the messy filing up of petrol! No need for the annual, trying to start the engine! And no more heavy lifting of the mower onto my lawn which is up three steps.
You just charge the battery and away you go. I had two batteries with mine which allows me to charge one encase the one I'm using runs out of power.

Power and batteries
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My grass was getting long so the first time I cut the grass with the Bosch rotak I thought I'd have to start of with a strimmer. The Bosch mower had no problem getting through the long grass on full charge. It did however struggle a little when the battery was getting low on power. But all I had to do was pop the fully charged one in. It cut the grass very nice and neat making it look better than my old petrol one ever did. The grass box was plenty big enough and was easy to change.
The batteries are powerful 36V Li-ion which got through the 8 inch grass on my lawn with ease.
Each battery Cuts my lawn, which is around 15m squared three or times over with one battery until the battery needs recharging.
There's buttons on the battery to press to indicate how much charge is left in the battery so you know when it's time to re-charge. The batteries charge up quickly I found it charged in around 30 minutes or so.
The old petrol mower was a struggle to lift up onto part of our lawn .The new Bosch mower is nice and light so my wife cuts the grass without me having to lift the mower up the bank for her.
There is Adjustable height changing on the mower to cut different lengths of grass. This is a little bit tricky at first, as you need two hands. One hand to hold the mower up and the other to adjust the height.

Cost
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The cost for the mower was around £270 from Amazon. You can also get Blades for around £16 of Amazon.
Additional batteries cost around £90 from Amazon.

Over all I'm very pleased with the mower.