balance charge

Hello everyone, I'm a newbie toward drone and this forum. (I apologize if I post in a wrong place) I recently purchased a LiPO 7.4 V 2000mAh battery but I have a problem on connecting the battery to the balance charging board. Problems: (1)Can anyone tell me what kind of plug is this on the...

I'm new here, but not new to RC, Mutirotors, Drones, or LiPo batteries. Been flying electric for 20+ years and have been around the block more than a few times building and flying LiPoly packs. I recently bought a Mavic from eBay and it came with 4 batteries and a ton of other stuff. Seemed...