Hi everyone,
I am trying to get a display to show volts and amps when charging 18650 LiPo cells with a TP 4056.
What I have done so far is to power with usb and connect LiPo to points E and F.
A volt meter is connected to D and G and this gives me charging volts. My ammeter has three wired red, black and yellow.
I assume the ref and black go to A and B, but where on earth does the yellow go.
I surprised myself as the charger worked first time on 2 LiPo in parallel and both cells balanced
In Hope
Keith
Your references to A, B, C, etc are meaningless unless you provide a link to the module you are referring to. A quick check on Google for TP 4056 modules ALL show B+ and B-.
Due_unto many thanks for your reply.
The module as stated is a new version TP 4056 and as shown in the attachment is a new style version having a battery protection circuit and a dual mosfet.
The new version can be identified visually by having 4 contact pads at the opposite side to the usb input and a micro USB, the old version having a mini USB and has 2 contact pads opposite.
Pads B+ and B- refer to the positive and negative terminals of the LiPo being charged. The 2 outer pads show the output voltage. the 2 pads nearest the USB I believe are for an independent input such as a battery where USB is not available.
Hoping that this makes sense ( attachment shows the old and new versions )
I am still wondering which pads are supposed to be A, B, D, E, F, and G. Be that as it may, the diagram you provided for the ammeter connection is quite straight forward. The meter red wire goes to B+ and the batteries, the black wire to B-. Disconnect the batteries from the B- terminal and connect that wire from the batteries to the yellow one. This way the meter can now sense the current flowing in the circuit.
Kaybee327:
I am trying to get a display to show volts and amps when charging 18650 LiPo cells with a TP 4056.
I surprised myself as the charger worked first time on 2 LiPo in parallel and both cells balanced
Hi Keith, I didn't know that 18650's came in LiPo version. Kinda seems like it defeats the purpose. 
Also those TP4056 modules are made just for charging a single cell. I wouldn't charge 2 or more cells in parallel if I were you.
Many thanks guys for the replies.
The lettering was my reference for the picture and they referred to the pads going clockwise.
Maybe I am a bit too ancient at 74 to start learning this stuff 
Noobian point taken re multi cell charging. I did start with a bank of 5 but had a 4056 for each cell. As for LiPo v Li-Ion I would offer the following extract from Wikipedia to prove my ignorance
The denomination "lithium polymer" has caused confusion among battery users. It may be interpreted in two ways. Originally, "lithium polymer" stood for a developing technology using a polymer electrolyte instead of the more common liquid electrolyte. The result is a "plastic" cell, which theoretically could be thin, flexible, and manufactured in different shapes, without risk of electrolyte leakage. These batteries are available[1] although the technology has not been fully developed and commercialized,[2][3][needs update] and research is ongoing.[4][5][6]
The second meaning appeared when some manufacturers started applying the "polymer" denomination to lithium-ion cells in pouch format. This is the most extended use nowadays, where "polymer" went from indicating a "polymer electrolyte" to mean a "polymer casing", that is, the soft, external pouch. While the design is usually flat, and lightweight, it is not a true polymer cell, as the electrolyte is still in liquid form, albeit it may be "plasticized" or "gelled" through a polymer additive.[7] These cells are sometimes known as "LiPo", however, from the technological point of view, they are the same as the ones marketed simply as "Li-ion", as the underlying electrochemistry is the same.[7]"
Due_unto thank you will give it a try after all things can only go BANG once hehe
Anyway thanks again guys
Keith
Kaybee327:
The lettering was my reference for the picture and they referred to the pads going clockwise.
Noobian point taken re multi cell charging. I did start with a bank of 5 but had a 4056 for each cell.
Clockwise in which picture starting from which point/pad?
TP4056 for each cell is how it's meant to be.
You really need to post your diagram with points clearly marked A,B,C,D,E,F,G... so that we can tell you exactly how to wire your voltmeter and ammeter to which points.
Hi Noobian,
Sorry for the delay been in hospital.
Hopefully attachment should show info required this time 
Keith
Hi Keith,
You can watch Julian Ilett's video to get a more detailed information about your module.
You can also see how he has connected his voltmeter.
Interesting video but unfortunately it did not help as I am OK with volts it is the amps that is the problem. 
On reading the replies again I missed due_Unto's suggestion so will give that a go.
Keith
Hi,
This may be what you are looking for.
Tom...
Tom George you are an early bird http://forum.arduino.cc/Smileys/arduino/smiley.gif mind I usually manage to get to bed between 3-4 am. Must be something to do with those wriggly worms.
Thank you for the pic it looks just what I need but what does "Must cut off" mean. To stupid me if the yellow is cut it won't sense as not connected ?
Thanks again
Keith
Well here goes - attachment is my interpretation of wiring for an 18650 cell. More than likely wrong Should ammeter be across the input voltage or the output ? Answers in a plain brown envelope please
