Replacement Batteries for NP-FW50: A bigger capacity of 1100mAh/8.1W, can charge inside the camera, or using the 2.1A USB input charger to maximize charging efficiency. NOTE: For optimal battery longevity, please fully charge the battery before first use Complete Two-Battery & Charger Kit: Triple your camera runtime with a complete backup package including two replacement battery and a dual battery charger to keep the empty ones charging Versatile Charging & Clear LCD Display: Common micro-USB/Type-c input and the ability to charge with a USB wall charger, car charger, or external power bank gives you more options than a standard battery charger; Designed with LCD display screen to clearly display the power level of each battery Standard Compatibility: Compatible with Sony ZV-E10, A7, A7R, A7RII, A7II, A7SII, A7S, a3000, a5000, a6000, a6300, a6400, a6500, RX10 Series. Multiple Circuit Protection for Safety: Built with multiple circuit protection (over-charging, short-circuit, high-temperature, and surge protection), and high-quality, fire-resistant construction