Which power source type is specified as the primary power supply for the device?

• A. 3.7V lithium polymer battery pack
• B. 3V non-rechargeable batteries
• C. USB-C power supply
• D. Lead-acid battery

Answer: (D)

Choosing a lead-acid battery as the primary power source means the device is designed for rugged, field-ready operation with reliable, easy-to-maintain power. Lead-acid batteries are inexpensive to manufacture, can deliver steady current over long periods, and are simple to recharge with standard chargers. They stand up well in harsh environments and are relatively forgiving in temperature variations, which is important for reconnaissance or field instruments that may be deployed for extended durations. While other options might offer lighter weight or higher energy density, they don’t typically match the combination of durability, replaceability, and straightforward charging that lead-acid provides in this context.