GREENWORKS claims its OptimusZ is ‘the ultimate productivity machine’. Engineered for all-day commercial use, the built-in battery module on the 24kwH CZ60R has safe LFP (lithium-phosphate) cell technology and, depending on load, allows landscapers to mow up to 21 acres with up to eight hours runtime. The 82V Prismatic LFP battery tech is notable for a few different high points, but a big one is safety. These batteries won’t ignite if there’s an issue with a battery pack. They only smoulder.