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The Yaesu FNB-78 Battery plugs into the FT-897/D. It produces 13.2 VDC at 4500 mAh. The radio can hold one or two and one can be in use while the other is charging.

An interesting article on choosing the right battery when operating in portable mode, considering charging time and modes, weight and size.

A simple charger designed for charging 12 V sealed lead acid batteries, used by radio amateurs for portable operation Amp-Hr Class used by radio amateurs for portable/emergency operation.

A solar powered station by IN3AQK using a 10W solar panel charging a 12v Pb sealed battery.

The charger described here is intended for charging small 12 Volt lead acid batteries

The article highlights the common absence of modern USB-C ports on handheld ham radios and the limited use of USB for power. The author, [jephthai], shares a solution involving a USB-C cable with power negotiation capabilities, allowing the radio to be powered by USB. By splicing Anderson power pole connectors onto the cable, the radio can now be conveniently powered by a USB battery bank, providing a practical alternative to traditional 12 V batteries for off-grid operations.

This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts. The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.

This tutorial demonstrates how to charge laptops or tablets, like the Microsoft Surface, using off-grid 12-volt batteries typically used for ham radio gear. The guide highlights the importance of selecting a reliable USB-C PD adapter, recommending a 15V, 60W minimum with 5–20V, 3–5A capability. Featured tools include a 100W USB-C adapter and a USB multimeter for monitoring power usage. The video also explores the compact, efficient Power Queen 50Ah LiFePO4 battery for portable power solutions.

Learn how to build an 8AH 12v LiFePO4 battery pack for emergency or field power. Discover the advantages of LiFePO4 batteries over lead acid ones, including safety features and flame retardant technology. Get insights on configuring parallel/serial setups and proper charging/discharging for optimal battery life. Find out about the recommended battery management system (BMS) to prevent overcharging or discharging. Explore the high short circuit capacity of 200 AMPS and the importance of using an inline fuse for safety. Follow WB5NHL Ham Radio's guide for building your own LiFePO4 battery pack for ham radio activities.