There are two ways to extend the duration of an uninterruptible power supply：

1. Increase battery capacity. According to the length of time required to increase the number of batteries, but this method will cause a relative increase in battery charging time, but also increase the number of corresponding maintenance equipment, increase product size, resulting in an increase in the overall cost of UPS.

2. Buy a larger capacity UPS. using this method can not only reduce maintenance costs, if you need to expand the load equipment, a larger capacity of the uninterruptible power supply can still work properly