We just introduced a four position simultaneous battery charger for Sony Alpha A9/a7RIII cameras. Special introductory price $349.00
TC40-SON-FZ100 Four Position Battery Charger [TC40-SON-FZ100] - $349.00 : Dolgin Engineering, Camera Power Products (http://www.dolgin.net/zen_dolgin/index.php?main_page=product_info&cPath=1&products_id=197)

https://www.bhphotovideo.com/c/product/1386330-REG/dolgin_engineering_tc40_son_fz100_np_fz100_four_position_battery.html/BI/2855/KBID/3801 (https://www.bhphotovideo.com/c/product/1386330-REG/dolgin_engineering_tc40_son_fz100_np_fz100_four_position_battery.html/BI/2855/KBID/3801/BI/2855/KBID/3801)