From The Unofficial FT-897 Wiki
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.
|Number of Cells||11|
|Full Voltage||13.2 V|
|Typical charge current||1400 mA|
W4RT One Plug Power OPP-897
The One Plug Power OPP-897 is a premium battery pack specifically developed by W4RT Electronics for the FT-897 and FT-897D. The capacity of this pack is the 4500 mAh, whcih is the same as the much more expensive Yaesu battery pack. The OPP-897 is properly fused and has the proper connectors to interface with the FT-897(D) and both the W4RT One FAST Charger OFC-897 and Yaesu charger.
|Number of Cells||?|
|Full Voltage||? V|
|Typical charge current||? mA|