Holds up to 72 batteries.
You can test battery strength with removable battery tester, make sure that the battery polarity is aligned properly with the appropriate port.
Battery power is indicated by the lighting combination below:
Good-All three lights (Red,yellow,green) are ON.
Weak-only the RED and Yellow Lights are ON.
Replace-only the RED light is ON. The current in the battery is very low and can barely function.
No light-The battery power is completely exhausted and the battery should be properly discarded.
Note: A fully charged 1.2V RECHARGABLE battery will only light the RED and YELLOW LED'S. This is normal.
Warning: This is not a toy, please keep away from children. DO NOT OVERLOAD!