法国采购需求：Andy Jib、Jimmy Jib、摄像摇臂、无线发射器、对讲机、电池

I recently purchased three batteries for my school's equipment, but I'm facing some challenges. I'm unable to find a compatible charger for these batteries once they run out, which is causing some inconvenience. Additionally, I need clarification regarding the appropriate voltage for charging them. Could you please provide me with this essential information? Thanks for your help!