Custom Charger: Dual TP4056 boards, Integrated volt meter.

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unknown00101
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Custom Charger: Dual TP4056 boards, Integrated volt meter.

My IOS 32650 charger arrived today. Ripped apart it seems like a pretty simple device.

My TP4056’s should get here eventually, I figured while I wait why not try to improve it a bit more?

http://www.fasttech.com/products/0/10002968/1222900-036-display-3-digit-...

I figured I would incorporate one of these nifty little things while I’m at it.

Only problem, I’ve never tinkered with chargers before. Is there anything in particular I should look out for, or is it at simple as it seems?

FlashPilot
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Ive had several of these things from different vendors and they have all appeared to be identical in this particular model. They are typically accurate to .01V, but not always. Calibration can also change over time so check frequently with a calibrated DMM to verify they are still accurate. They also tend to burn out or dim quickly when left on, so I would add a momentary switch for quick measurements when needed. Use good soldered connections or inaccurate readings and wild fluctuations may occur. IMO, they are a gimmick to give a ballpark measurement, but definitely not to be relied upon in providing consistent accurate measurements. The amber/yellow ones appear to be the brightest, and far to bright for night use with flashlights projects.

unknown00101
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I was hoping for something on the partially helpful side of gimmick for $2. Silly

I’ll definitely continue to check everything with my DMM.

Would you recommend any particular momentary switch?

Thanks.

FlashPilot
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unknown00101 wrote:
I was hoping for something on the partially helpful side of gimmick for $2. Silly

I’ll definitely continue to check everything with my DMM.

Would you recommend any particular momentary switch?

Thanks.


You’ll find thousands of them on ebay.
unknown00101
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TP4056 boards have arrived, along with a few questions.

1. Is there a way to test these without a battery in order to verify they’re charging properly?

I’m planning on running a micro USB to USB cord into an extra iPhone AC power adapter plug, output 5v.

2. Is this suitable for the dual TP4056 boards?

Helios-
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2. Check the label on your iPhone AC adapter. It will say how many mA or amps it can provide. You may need 2A usb to get a full 1.7A out of dual tp4056. Some power is lost toward the begining of cc/cv. Any usb power source will work.

Ok, any usb power source should work, I think I’ve read of a cheap chinese one that died from trying to provide more amps then it could handle. But any quality one like apple would be fine. You will get only as many amps as it can provide but no harm in trying for more. It will just gracefully not give you more. People have even used a lower amp usb power source on purpose to limit the charge rate.

~ edit ~
A junk or thin usb cable could also limit your amps. No harm, just limits the power.

1. Without a battery, not really. You could check that they aren’t DOA but thats about it. Without a battery the done led (green or blue usually) will come on steady, charge led (red) blinks. Check that the chips are marked TP4056.


Counterfeit 18650s, 2,<a href=“http://

unknown00101
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Thank you!

The adapter shows 5v at 1A, guess ill try it out and see if I need a better one.

Helios-
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I just noticed there are now some boards on ebay with chips marked “TP4056” but lack the stylized TP logo. Have to love chinese companies. Flat Stare

These chips without the TP logo are likely Tapower “tp4056” chips. I’ve never had these, haven’t seen anyone else get them or test them.




Original tp4056 NanJing Top Power chip.
This is the chip that HKJ tested & the ones I have. All pictures I’ve seen of boards that others have posted show this chip.


Counterfeit 18650s, 2,<a href=“http://

StyXSIS
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I have seen something almost like what you’ve thought of building before while i’ve been looking around and though that
this might give you an idea
You can add voltmeters if you want as far as i can see.

Simon

Pavithra_uk
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I have that TP4056 boards with TP logo in chip. works fine
And board with no logo chip also works fine but they has interesting behavior

if input voltage below 5.0~5.1V, standby/full charge LED blink randomly. it doesn’t keep glowing.
if voltage over 5V, it works like chips with TP logo.

unknown00101
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Alright, getting back into this charger build I’ve made a bit of an error.

I forgot about the little charge indicator lights on the tp4056 boards.

I need to somehow stretch the light about 11mm directly up through some black plastic. Any ideas on material, or some kind of glue or something that I could fill/cover the hole with to bring that indicator light to the surface?

Edit: The little volt meter arrived today. Neat little thing, definitely not to be relied on though. It only shows data to 1 decimal point. I’ll still use it just for kicks, maybe an occasional rough estimate. It’s going to be fun trying to fit it in the little single bay charger along with the 2 boards and the giant switch I chose. Smile

It also reached a scorching 16* F in the work space today so I should be able to get back to working on mods in… about 4 months. Big Smile

StyXSIS
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If you can find a piece of clear plastic, something that you can clearly see through, like a cassette tape case, you can cut that into the sizes you want for strips that will be clear in the center, with a junior hack saw is best, the long cut sides can be left rough and the top tip and bottom tip can be sanded flat, then you use a lighter to melt polish those surfaces on the two ends by lightly flowing the flame accross each end not constantly on them but very fast on-off, on-off until they look clear/seethrough, and that will make them clear/seethrough at each end like the center, it will be enough that it will give you a length of clear plastic in the middle that the led will beam light from the board to the other end giving you the extended light length you want.
I hope you understand that, i’d show you what i mean but i’m not at home, sorry about that.

Simon

unknown00101
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Sounds great, you explained it very well; thank you. I’ll give it a shot.