On Order Franklin Dictionary Battery Li-Polymer Battery fits Franklin, Est-4016, Franklin 3.7V, 450mAh CS-FNK406SL $28.82 This product that we supply may be a generic version of the battery, but we can assure you that it is designed and built to be as robust and as good performance as the original battery. Batteries come in a variety of different formats, often a single model of battery will actually replace hundreds of other models in a multitude of different devices. The... Add to cart