if the battery of a UPS is replaced with a car battery,will it be able to give loger time of power ?

Answer 1

The main consideration is that the internal charger of the UPS is calibrated for Nickel Cadmium batteries. If it senses peak voltage (as most do) to reduce the charging current, the lead acid car battery may not reach the same level as nicads and continue to charge at high rate. This is not a problem for the battery which can withstand a continuous charge of more than the charger can likely deliver. However the charger may overheat thinking that the nicad battery still needs more charge because their peak voltage is not achieved.
Since the ups is probably not worth the expense of replacing batteries with original types and you still desire more capacity, you might as well try it and monitor the charging current and check the unit for heat.

Batteries of the vented type require air circulation to dissipate dangerous hydrogen gas.

Instead of using your computer for testing use about a 150W light bulb as a test load. It requires about as much power as your computer and will give you a rough idea of capacity and if it will recharge after a couple of days without a problem.

Answer 2

Yes.

Better still, replace the UPS with :
A battery charger, a battery , and an inverter.

Connect your computer to output from the inverter.

You will have all the protection you need, and can run your computer for hours if the power from the mains cuts off.

Answer 3

There are much better batteries than car batteries to use. Also a series battery system will last ages.

Answer 4

presuming the ups battery is a sealed lead -acid ,12 v type,yes
a car battery would last longer.a better candidate would be a deep cycle storage or marine battery.beware of charging dangers .

Answer 5

stuudy what is kwhr ,you will get answer.

Answer 6

you can use an inverter.