Batteries, cables and power supplies can cause more trouble than their price suggests

Periodically inspect installed batteries, power cables and external power supplies.

Remove batteries from equipment that will remain unused for a long period where the documentation permits, particularly when leakage is a concern. Replace cables with damaged insulation, deformed connectors or power supplies showing overheating, noise or abnormal behaviour.

For power supplies, always verify compatible specifications: voltage, available current, polarity and power type must match the equipment requirements.