This Dolgin Engineering Four-Position Battery Charger for Sony NP-FZ100 is a simultaneous charger for up to four NP-FZ100-type batteries compatible with the Sony a9 and a7R III cameras. Charging positions are grouped in two banks of two plates. To get the fastest charge time when charging two batteries, for example, place them in positions 1 and 3. Each battery achieves full charge (greater than 90%) in less than 2.5 hours, and this increases to up to 4 hours when two batteries in the same bank are charging. The charger accepts worldwide AC power and comes with a US power cable. The charger can also be powered by a 12 VDC power source using an optional cable. Each bay features a red and green LED that indicates the charge status of the battery.