A:Answer Hi there,
To determine the current charge level of your batteries, press the Power
On/Off/Battery check button (when your speaker system is powered on)
on the top of your speaker system. The charge is indicated by the number
of circles shown on the display. When all four circles light, the batteries are fully charged.
- Janína G. | Insignia Support | https://www.insigniaproducts.com/contact-us