Amardeep Inverter AC-DC Emergency LED Bulb B22 9-Watt (Power Backup Upto 4 Hours),White Now enjoy continuous lighting experience with AMARDEEP AC-DC LED BULB 9W. It has 2600mAh Lithium-Ion battery with BMS technology which gives you continuous lighting back up to 4 hours. It will take 8-10 hours for full charging. NO FEAR FROM POWER CUTS.