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Connect the battery to a regulated 4.2V or 8.4V power supply; Most lithium-ion batteries should be able to charge safely using this simple method. It's as simple as that. The hardest part is making the connection; the hack here is using aluminum foil stripe and tape. You can also use a voltage-compatible charger to charge the same voltage battery, but most chargers will not activate its main output voltage unless the temperature pin is also connected , i.e., having a voltage level of about 0.3-0.7V;