5V 1A Micro USB 18650 Lithium Battery Charging Board Charger Module+Protection Dual Functions Note: The charge should disconnect the load OUT terminal on the positive and negative can not be wrong, please according to specifications, otherwise it will damage directly. Module Features and parameters: Inputs with MICRO USB female, can be directly input to do with the phone charger rechargeable lithium battery, And still retains the input voltage wiring pads, can be very convenient DIY Input voltage: 5V Charging cut-off voltage: 4.2V ± 1% Maximum charge current: 1000mA Battery over-discharge protection voltage: 2.5V Battery overcurrent protection current: 3A Board size: 2.6 * 1.7CM Module application scope This module is used for single lithium electricity section or more parallel lithium batteries charging, charging port can be from the USB power. Instructions/matters needing attention 1. The test current ammeter can only be concatenated in 5 v input pad. 2. The charging current is the best battery capacity of 0.37 C, is 0.37 times, the capacity of 1000 mah battery charging current of 400 that will be enough.Too fast charging effect is poorer, rushed over battery voltage drop is much! 3. The charging connection wires cannot go too long.This connection resistance.Too fine rushed over battery voltage drop is much. 4. Good contact with the battery connection is best.Or rushed over battery voltage drop is much. 5. If 5 v input voltage on the high side, 5.2 and 5.5, for example, can cause lack of charging current 1000 ma, this is normal.The high voltage chip fever will automatically reduce the charging current, chip burned down.Chip in the work of about 60 degrees fever is normal.After all, charging current is big. 6. Enter the reverse has no effect on the chip, but the output (battery) reverse connection will burn out the chip, buyers, please note.