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If you run a small battery repair shop or build battery packs regularly, voltage imbalance is probably one of the most common problems you deal with every week. A pack with uneven cell voltages loses range, delivers poor performance, and can even become unsafe over time. The problem is, not all balancing tools solve the same issue. Many shop owners start with a cheap active balancer, only to find that the voltage drifts right back a few days later. Others jump straight to an expensive industrial …