CA121-B is designed for LFP battery compared with CA121-A for Li-ion and Li-Po.They share the same aluminium alloy shell but you can telll one from the other by the silk print on the apperances.

• 平衡充电器CA121-B适合于磷酸铁锂电池，CA121-A则适用于锂离子和锂聚合物，它们的外观（铝合金壳子）是一样的，只有上面的丝印不同，请留意区分清楚。