How to power with old phone batteries
Posted:
Fri Jul 07, 2017 2:09 amby Dogukan Ucak
İ have nodemcu lolin board i want to power it via phone batteries 3.7v is that possible if it is which pins do i have to connect between battery and nodemcu.
And last question how long it will go with 800mah battery and a/2000mah battery
Re: How to power with old phone batteries
Posted:
Sun Jul 30, 2017 2:48 pmby ohgary
You need to look at how to not only power the device but how to recharge it. There are a number of lipo battery charging modules but most use the TP4056 chip to do the heavy lifting. Battery in 1 side, out comes 5 volts. micro usb to charge. Something like
http://www.ebay.com/itm/5V-Micro-USB-1A ... SwD5BZbs8P would work. This can be fed to a 5 to 3v regulator such as the AMS1117-3.0
http://www.ebay.com/itm/3V-Out-5V-to-12 ... ysf55I4pLw or similar.
Now you have 3 or 5v for devices from a 3.7v battery as well as a way to charge the battery.
Re: How to power with old phone batteries
Posted:
Sun Jul 30, 2017 10:07 pmby rudy
Dogukan Ucak wrote:how long it will go with 800mah battery and a/2000mah battery
Considering they are 'old' the only way you can tell is by trying it. I have some old phone batteries that still are useful to me but they can't run the phone anymore. A 800mA battery that only have 20% of its capacity will not go far.