Icom IC-F3100D series Instruction Manual page 49

There are two types of BC-197 chargers for the IC-F3100D series
or IC-F4100D series; one is for Ni-MH batteries, and the other is for
Li-ion batteries.
Before you purchase a BC-197, check the type of battery you are
using, and then be sure to choose the suitable charger.
BC-197 Charger Type
With AD-120* charger adapters BP-264 Ni-MH battery
With AD-121* charger adapters BP-265 Li-ion battery
* The type of the charger adapter, AD-120 or AD-121 is printed on the
inside bottom of the charger adapter, and the type of battery it holds is
printed on the top right corner of the adapter.
BATTERY CHARGING
Chargeable Battery
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