3.7V, 1800mAh, Li-Polymer Battery fits Fiio, Fx1221, X1 Ii, 6.66Wh

Battery Fits Models:- Fx1221, X1 Ii

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Battery Part Numbers:- Aec404677

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Our equivalent battery is made with premium cells and is rated as shown in the specifications on the product page. The battery shown will replace your original and provide you with an economical alternative to expensive OEM batteries; we also guarantee the battery to be fresh and free from defects.  Batteries come in all shapes and sizes; quite often, a single battery model will replace hundreds of other models. The manufacturers, in their wisdom, have assigned different part numbers to like batteries. We can usually cross-reference this product to the correct replacement for you.  Batteries come in all shapes and sizes; quite often, a single battery model will replace hundreds of other models. The manufacturers, in their wisdom, have assigned different part numbers to like batteries. We can usually cross-reference this product to the correct replacement for you.  You can confirm that this particular battery will fit your device by checking the tables below. If for any reason, the product develops a manufacturing defect during the 12 month warranty period, we will replace the defective item free of charge. Battery life is dictated by several factors, including temperature, charging frequency, and type of charger. As a rule of thumb, Nimh cells can be charged around 500 times, Lithium-Ion around 400 times, and Lithium-polymer Around 400 times. This can increase or decrease depending on the use of the battery. The batteries we supply are manufactured to a very high standard. To keep our ISO 9001 certification, strict protocols need to be followed. This ensures that the replacement batteries are safe to use in the device they were designed for. This battery should meet or exceed the specifications of the original OEM battery. All of the known fitments for this product can be seen in the table below. Special Remarks:- None at this timeYou must check that you are going to order the correct battery. To be certain of fitment, make sure that the battery number, device model, and manufacturer are listed in the description. This is the only guarantee that this is the correct battery. Contact us if you would like us to confirm for you.Mah is the figure that estimates the charge that a battery will hold. The higher the Mah, the longer the runtime.