In batteries BL-5C series is the most popular battery type in Nokia Phones. They have the widest compatibility with other .
The only difference between the BL-5C, BL-5CA & BL-5CB types is battery Charge Carrying capacity.
These are all interchangeable i-e, you can use in any one for you compatible Nokia Mobile sets.
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The breakdown of battery capacity is as under:
BL-5C - 970 mAh
BL-5CA - 700 mAh
BL-5CB - 800 mAh
Therefore the BL-5C - 970 mAh will give a longer battery time for your set as compared to BL-5CA, BL-5CB.
Posted By Fiz87