LED not lit check power supply
Green LED Trickle Charge
LED steady red charging in progress
Flashing Red LED Not charging*
*Touch the battery. Is it warm? The DSP monitors the temperature of the battery. If it is too warm, it will not charge it. Disconnect the power supply and allow it to cool down before trying to charge it again. This can happen with NiMH batteries. If you continue to have this problem, the battery may need replacing. You may wish to reset the battery first, details can be found at here.