Lithium-ion secondary batteries; [ nickel-zinc secondary batteries; ] batteries and electrical cells; secondary batteries; electric accumulators; optical lenses to narrow irradiation range of LED; optical lenses for LED; optical lenses; optical lenses that improve light output and uniformity for use in LED water and air purifiers and in resin curing applications

'accumul':18 'air':47 'applic':53 'batteri':5,10,11,16 'cell':14 'cure':52 'electr':13,17 'improv':36 'ion':3 'irradi':23 'led':26,30,44 'lens':20,28,32,34 'light':37 'lithium':2 'lithium-ion':1 'narrow':22 'nickel':7 'nickel-zinc':6 'optic':19,27,31,33 'output':38 'purifi':48 'rang':24 'resin':51 'secondari':4,9,15 'uniform':40 'use':42 'water':45 'zinc':8

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