Admirable goal for sure, always good to help out.

If I may offer some unsolicited advice, be careful balancing out of whack discharged lipos. If they are out of balance discharged it quite possibly (likely?) because the cell capacities are different.

If so, balancing while discharged will most likely make the situation worse. If they are charged without a balancer the different capacities will result in a cell being overcharged, which is literally dangerous. Even if balance charged the balancer will have extra work to keep them balanced. Also one risks further damage from over discharging cells from the repair balance process.

My apologies if this is unneeded advice.