inside the bottom of an FT-897 showing the twin fans and twin 4500 mAH Ni-MH battery packs
The FT-897 battery charging scheme: PA-26 AC-Adapter (24VDC, 1.85A)
to CD-24 Rapid Charger (input: 13.8VDC at 2.3A or 24V at 2A;
output: 16.5V at 1.4A) to battery.
Each battery has its own rear panel charging connector.