18650 Li-ion Battery Solar Charging Module 4.2V 3.7V 3.6V Charge Board
ab 1,19 €
MINI USB female chassis and the + - pads next to the power input, access to 5V. (When the L2 light is on, L1 flashing fast indicates that the saturation state). Chip in the work of about 60 degrees heat is normal.
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