Bonka 7S Europa

Thanks. If there’s nothing better I will order these. Any recommendation for the charger??

Has anyone flying a batch 4 with 6s battery considered adding 2 cells to come to the optimum voltage, or would the small 2s added battery heat-up differently and would make the -(6s-6s-2s serial)- assembly unusable?/unsuitable for use?
Am I too ignorant about batteries…?

It’s certainly not ideal. At the very least you’ll want to make sure the cells are all the same capacity (and chemistry) so you get an even discharge.