The rugged USB charger has been designed in response to the need for larger more powerful battery sources in a compact format for use with smartphones and accessories when they are being used on site for monitoring and testing/commissioning. The rugged USB battery charger/power source is ideal for keeping sensitive and expensive devices not only topped up with power but also for protecting them from harsh environments. The now standard 5V USB and microUSB charging leads and connectors can be used with any smartphone and most accessories.