Actual 230 mAh capacity with durable and reliable performance, the highest capacity of its type. Leakproof and self-discharge rate is less than 1% per year at room temperature in original package. 100% compatible with PetSafe RFA-67 RFA-67D-11 batteries; never popping out or falling out from the collars. Molded-in waterproof gasket seal by using premium TPE material. Easy to install; never falling apart with excellent ultrasonic sealing