Description:
This PCB can stepup a lithium ion battery to 5V for USB output to 5V USB devices, like iphone, mobile phone, tablet PC. This module also contains protection circuit which will stop stepup output when Lithium ion battery is below 2.5V. Just connect a unprotected lithium ion battery to the battery input source.
There a blue backlight LCD which can show the battery level in %, charging status, and also the output USB currentdrawn by the USB device.
The LCD is controlled by a 12bit A/D to convert battery voltage level from 0% - 100% in 1% steps, to accurately show the battery capacity remaining or charged.
<3.0V - 0% , 3.7V - 50%, 4.2V - 100%
This PCB also support charging the battery. Simply supply a 5V microUSB source to the charging input and it will charge the connected battery to 4.2V
Great for mobile power source using Lithium ion batteries (unprotected is also ok).
Connect multiple batteries to the battery input to increase the capacity power capacity
Procedure:
1. Connect 4.2V li-ion battery to the soldering point or the battery jack.
2. Activate the circuit by charging with a microUSB adapter
3. push the switch two consecutive times to activate the emergency LED lighting, push two times to deactivate it.
Connection please see the image
Never reverse the connection polarity.
Specifications: