DO NOT CHARGE NICAD WITH A LEAD ACID CHARGER.....

if the razr was using nicad, and the same number of cells, then ok, but an sla charger is not suitable for Ni cells !

With any luck, it will over-charge and kill the pack in a few cycles, at worst it could cause the pack to explode.

A proper Ni ( nimh or nicad ) charger should detect voltage drop between pulse charge cycles and/or temp rise using a thermistor embeded inside the pack... SLA has none of this and does not really care...