Rapala Rechargeable Cordless Electric Fillet Knife Relaxed Grip Body. The red light will then go on indicating charge. You also want to be sure that the grey button on the battery is facing the back of the base charger. This will ensure that battery is charging in the correct position. Dual Rechargeable Battery Packs Advanced Air Flow Design A 6 inch and 7-1/2 inch blade are included AC Battery Charger. Kindly refer the user manual under product details for troubleshooting steps and instructions.