Backup battery
A backup battery or backup battery is used to supply power to electrical and electronic devices in the event of a power failure or to compensate for different load conditions (voltage stabilization, interception of brief load peaks).
One example is data retention or the continuation of the real-time clock in personal computers or programmable logic controllers when they are switched off or disconnected from the mains. The starter battery of vehicles with combustion engines also fulfills support functions (see load dump ), but is primarily used to start the engine.
Buffer batteries are designed as batteries or accumulators , depending on the requirements .
When using backup batteries, their maintenance and special features must be taken into account when disposing of the devices. For consumers with low power requirements, the backup battery can be replaced by a maintenance-free capacitor .
Backup batteries for data retention are being replaced by the introduction of non-volatile memories, e.g. B. EPROMs , superfluous in many areas.
Even traction batteries and so-called solar batteries are sometimes used as backup batteries meet or referred to such a function.