UPS's recharge the batteries during normal power. The recharge current will make the batteries temperature rise some.
UPS, Uninteruptable Power Supply.
In an uninterrupted power supply there has to be a source of power when the electrical utility is not there. The only supply that is available is a battery that is in or connected to the UPS.
If your battery is dead and you connect the power supply with your battery installed, the battery will automatically start charging. If you wish to run your MacBook off your power supply only, simply remove your battery from your MacBook and connect the power supply. You will then be running solely on the power supply. If you battery becomes fully charged while your power supply is connected, you MacBook will switch to the power connector as it's power source - preserving the battery.
A battery-operated smoke detector is one which is not connected to your homes power supply.
battery
It depends on the context... The two commonest forms of UPS are a courier company (United Parcel Service) - and (in computing) an Uninteruptable Power Supply.
The best battery backup for your desktop and/or server computer is a UPS (Uninteruptable Power Supply). Each make and model have different attributes (AKA can power performance computers, or cant power performance computers, but does last a long time). check the reviews on each UPS system to see if it is the right one for you.
When connected to a normal power supply a UPS takes enough power to keep its battery charged and passes the power through to the device to which it is attached. When normal power fails the UPS uses its batteries to deliver clean power to the attached device.
what
The current in a circuit, expressed in milliamperes, is1,000 x (battery or power supply voltage)/(resistance connected between the power supply terminals)If you increase the voltage of the battery or power supply, the current in the circuitincreases proportionally, at least until something in the circuit gets hot, melts, fuses,and opens the circuit.
A UPS (uninterruptible power supply) works by providing backup power to electronic devices in the event of a power outage. It typically consists of a battery that stores power and an inverter that converts the stored DC power into AC power. When the main power source fails, the UPS switches to battery power to ensure continuity of power supply to the connected devices.
Software for that Uninteruptable Power Supply is available. The most reliable source of the software seems to be a company whose web address is eaton.com