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Also you can just use the same charger you used for charging your old battery. Both battery types will be 3.6V nominal anyway. And you do not need to worry about the different battery capacities (1400 mA/H and 3000 mA/H) the charger will take care of that. The only difference will be that your portable DVD player will play for at least twice as long with the new batteries.I want to power up my portable DVD player by removing defective li.po 7.4v 1400mah battery and connecting external li.ion 7.2v 3000mah (2X3.6v 3000mah 18650 battery.kindly suggest the charger circuit for the above.