What you want to ask is the reason why the battery of Emerson 475 handheld device can't be charged. There are two reasons.

1. When the battery is in an overdischarge state, it means that the battery is exhausted and in a dormant state. It takes 3-5 normal charge and discharge cycles for the battery to be activated and charged normally.

2. When there is a problem with the charging circuit of the charger, it needs to be replaced before it can be charged normally.