Description:
This is CD42 5V 2A Charge Discharge 3.7/4.2V Lithium Battery Boost Protection Board. When using lithium battery, its charge and discharge need a circuit protection to protect the lithium battery from being charged or damaged or to obtain safe power supply from the lithium battery. The mobile power module is used as the charge and discharge protection for lithium battery. Compared with the general lithium battery protection board, the module has four LED indicators to indicate the current power of the lithium battery.
Specifications:
Input voltage : DC 4.65V-5.5V
Overcharge protection voltage: 4.2V ± 1%
Over discharge protection voltage : 3 ± 1% v
Charging current : 0-2.1A
Discharge current : 0-2.4A
Input protection: : over current, over voltage, short circuit protection
Output protection :  over voltage, overcharge, over discharge, over current protection
Operating temperature range : 20℃ to + 85 ℃
Product size : 25 *16mm/0.98*0.62”
 
Operation:
1. Function features: key on / off; support charging and discharging at the same time; 4 LEDs, 4-level power indication; intelligent identification of load, automatic standby, standby current less than 100uA; Self-adaptive charging current regulation, self-adaptive adapter.
2. Key function: if the duration of the key is longer than 50ms but less than 2S, it is short press action. Short press will turn on the power indicator and boost output. The key action less than 50ms will not have any response. Press the key twice in a row within 1s, and the boost output, power display and lighting LED will be turned off.