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    Using 7R's drop-in charger for 8R

    The battery polarity is the same for 7R and 8R, and the charging contacts are identically distributed. The 8R battery fits in 7R's charger. So, it is feasible to use 7R charger for 8R. The only problem is that because the 8R battery is thinner and its charging contacts are about 15mm...