How would I go about buying/making a charger port that i could incorporate into my project that charges 150mah lipo batteries? Preferably smaller the better.
Thanks
Check out the MCP73831 chip, that's being used in a lot of things these days and seems very simple to implment.
looked it up and wish they had a non smd version. I looked into it further and realized this was out
i feel like i would have to hook up a resistor somewhere in order to charge such a small mah battery (150mah)
I usually use TP4056, a very cheap charger IC from China. It's a good option for mobile app with Li-Ion battery.
Regards,
That's the one i was looking at.
It says i qould need to change the resistor based on my battery.
R1 K I(mA)
30 50
20 70
10 130
5 250
4 300
3 400
2 580
1.66 690
1.5 780
1.33 900
1.2 1000
40% of the battery is the mah ot needs to charge so for my 150 mah battery i would need 20 r1. What does that mean 20 ohm?
What does that mean 20 ohm?
Are you seriously asking what a 20ohm resistor is?
Graynomad:
Are you seriously asking what a 20ohm resistor is?
Lol no. I forgot to add a comma and a few words to my question.
Rephrased for ya.
What, does that mean I need to use a 20 ohm resistor?
But if you had read my whole post you'd probably could have guessed that. Everyone in here is so quick to jump on newbs. We were all there at some point, and I still am.
So what they are saying is that you replace that resistor with the value you need to limit the current as appropriate for your battery.
That's quite clear in the DX page and also in the TP4056 data sheet.
If you look at the resistor connected to the TP4056's pin 2 on the DX photo it's a 1k2 so they default to 1A, just remove that resistor and put your 20k (or whatever) in it's place. Note that the data sheet only goes to 10k, where did the 20k and 30k values come from?
We were all there at some point, and I still am.
Not me, I started as an expert and worked my way up from there 
I use these for just about everything..
Adafruit Pro Trinket - 5V 16MHz : ID 2000 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits - A -tiny- 5V Arduino. (I go through these like M&Ms.)
And then add this..
Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy : ID 2124 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits - A lithium battery charger that attaches to it.
And lastly..
Lithium Ion Polymer Battery - 3.7v 150mAh : ID 1317 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits - Your 150 mah battery that plugs into it.
Done.
-jim lee
Awesome thanks everyone for their answers. I ordered some 10k smd resistors and some of those TP4056 and Im going to try my hand at switching out those resistors to make sure the battery doesnt blow up. Lucky for me I own a vape shop and have LIPO charging bags on hand so i'll definitely be using them on the first few charges just in case. Will let you know once I get everything in through "snail mail" and post updates.
You can get ready built PCBs with the TP4056 already fitted, I bought 10 of them for £2.50 delivered.
One key factor is choosing the charge current, the PCBs mentioned above will charge at circa 500mA to 1000mA, way too much for small LiPos, so you need to change the charge limit resistor to reduce the current to a safe level for the chosen battery.
But charging is only part of the problem, you need some way of ensuring that the project turns off when the battery drops to circa 3V, go much lower and the battery can be damadged and be dangerous.
Given the risks associated with Lithium batteries, building a Lithium charger out of parts is best left for those that know enough about it that they dont have to ask questions.