Woooooooow very very good and very good product im so happy and packaging super
I have make a remote control car
Product worked well for my Linux pc, no drivers needed, simple installation.
2in1 charge discharge board module DIY 18650 lithium battery Power Mobile Bank
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5V Step-Up Power Module Lithium Battery Charging Protection Board USB For DIY Charger 134N3P Lithium Battery Charging Protection Board Boost Converter LED Display USB For DIY Charger 134N3P High-Quality USB iron with Cheap display port video card and Integrated Circuits.
BAT Discharging Stop Voltage: 2.9V.
Discharging Efficiency:85%(input 3.7V output 5V/1A).
Charging and discharging indication.
Internally installed charging and discharging power MOS.
Preset 4.2V charging voltage, precision ±1%.
Max 8uA standby current.
Integration charging management and discharging management.
Intelligent temperature control and overtemperature protection.
Integration output overvoltage protection, short circuit protection, overload protection.
Integration overcharging and over-discharging protection.
Support trickle mode and zero voltage charging.
When charging: red light flashing.
Fully charged: Red light glows for a long time.
| Input Supply voltage (V) | 3.7 ~ 5.5 | 
| Charging Current (A) | 1 (max) | 
| Output voltage (V) | 5 | 
| Output Current (A) | 1 | 
| Length (mm) | 23 | 
| Width (mm) | 17.5 | 
| Height (mm) | 12 | 
| Weight (gm) | 3 |