In means of mass transportation, and especially in subways, reliability of batteries is of utmost importance. Ni-Cd batteries that are used in subways are used for providing stable functioning of the system in exraordinary and unplanned circumstances.
These batteries must provide:
Powering of the low-voltage network in the event of shutting down the main source of power for the period of 30 to 90 minutes
Unexpected demands of consumers for additional electricity in the regime of parallel operation
The HK „Krušik“ a.d. offers Ni-Cd batteries with pocket plates type KPL and type KPM for use in the above circumstances.