I not good with this kind of stuff so can some one explain to me if this is good.

My stock e-flight battery test at 8.4v if i'm reading my meter right.
I'm not sure how to check each cell but so here are some pictures of what i did. can you guys tell if if i did this right and if my batteries are ok.

on the balance charge lead there are three wires red blue and black.

with my voltmeter on black and red I read 8.4
on the black and blue it reads 4.2
on red and blue reads 4.2

If I'm reading my meter right then it seems my battery are good? Please someone check my pictures to see if I am doing this right.