Instruction Manual
Page 32
... also cause damage to the battery or degradation of Lithium-ion batteries may result in the following hazards: smoke, fire, or the battery may cause an explosion. Use and charge only specified Icom battery packs with the transceiver for D Battery caution which it has been severely impacted equipment, or for use a wet battery. Only Icom battery packs are tested and approved...
... also cause damage to the battery or degradation of Lithium-ion batteries may result in the following hazards: smoke, fire, or the battery may cause an explosion. Use and charge only specified Icom battery packs with the transceiver for D Battery caution which it has been severely impacted equipment, or for use a wet battery. Only Icom battery packs are tested and approved...