Only the ampere differentiates on the basis of the price range. The more your ampere rating will be the more backup it will provide throughout the day.
Approx: 10 Ampere = 1 Hour Backup [On 100W appliances]
Good quality always holds weight, When buying a battery you should check the weight of the filled battery and compare it with the same ampere battery choices
You can estimate the lifespan of your battery by just adding a few months or years to the warranty period of your battery. There are some rare cases where the battery doesn’t last till the warranty period.
Almost every battery lasts for 4-6 years. But always try to look for a reputed company with more warranty period.