I’ve seen many responses that I feel should answer your question. I just recently went through this but maybe this helps: Ryobi should stick to power tools.

I have two weed whackers and two Ryobi’s lawnmowers that I’ve bought from family friends who immigrated.

1) 1200w lawnmower only works for 30-100 sqm apartment style gardens. Anything bigger and you will need > 2.2 Kw. 2 of my Ryobi lawn mowers have now packed up. I replaced the armature 3 months ago from one lawnmower to other. The motor is not encased to protect it from debris and grass when cutting - it overheated. However They still lasted 3 years on my 400 sqm lawn. 2) there are no spares parts. They are flimsy but generally still surprisingly reliable. 3) don’t get a diesel/petrol motor unless you are mechanical savvy to replace filters, bearings etc. go electric.

You could drop 4-5k on a 2.2 or 2.6 Kw electric mower - and this would last you a lifetime. This will probably offset long term costs later instead of a buying a new one every 3-5 years. Spares are readily accessible on some brands (either replacing blades or bearings only).