On Order Casio Mobile, Smartphone Battery Li-ion Battery fits Casio, c721 3.7V, 600mAh CS-CTR721SL $27.13 Batterybuyer have been a source for replacement batteries from Cameron Sino for over a decade. In that time we have had not one instance of a product being damaged while using one of our batteries. Finding the correct battery for your device can be difficult. There are a huge range of models and part numbers and it can be confusing. Believe us when we... Add to cart