If you want a longer runtime, you'll need to pick a UPS with better efficiency, a longer lasting battery, higher voltage batteries, or all of the above.
Ọ bụrụ na ịchọrọ oge gafere ogologo, ị ga-achọ ibudata UPS na arụmọrụ ka mma, batrị na-adịgide adịgide, batrị batrị dị elu, ma ọ bụ ihe niile dị n'elu.