How old are the batteries?
Have them be left drained for more than 1 or 2 days? If the batteries have been left drained to long, they are DEAD!
Stored Li-ion batteries slowly loose their charge and need to be recharged about every 6 months when NOT used.
Your charger may be OK, but the batteries dead.
Try with another battery.
Most of the time, the charger outlive the batteries.
Electro
August 2013