I already have reduced charging current to 130mA because i am charging a 350mA 10440 battery, and it is with that reduced charging current i only get 4,17v.
@Halo, how would i provide the ground slightly higher? is it by somehow feeding the - on the 5v side with a to start with 0,03v load?, do you have any idea how i could do that? maybe by a battery or a adjustable powersupply……
Or do you mean that i should pull 0,03v of the 5v power source i use to power the board?
below 4.2vdc that is the batteries internal resistance resting/stabilization point…trying to get it to EXACTLY 4.2vdc will rarely happen…
If it stays well above 4.1vdc after a “full” charge the battery is still good…if it starts going much below 4.1 after the charger says it’s charged then it might be time to retire that battery as it is no longer anywhere near it’s 80–100 capacity anymore
I put 2.2K resistors on mine…I get right at 500mA charge current and the batteries terminate much closer to 4.2vdc…takes a LONG time…but that is the nature of the beast…lower charge current but also less stress on batteries and more charge cycles but much much longer charge times
Hi Kaiser,
I do not know what the additional BAT- connection is for yet, It may be that they are common battery grounds.
On the original board a MOSFET (8205A) disconnects the negative battery terminal when the battery voltage drops too low. I am hopeing that the EN connection will do the same from an outside signal.
R & G connections are for a 3 pin dual colour LED.
I have ordered some to test and will let you know my findings.
I am trying to create a type of 5V UPS for a Raspberry Pi.
If you find anything usefull about this type of TP4056 please let us know.
I already received mine and used for what it was intended for. I had a cheap Tesco branded cordless screwdriver. I wasn’t using it much because batteries didn’t last long and it takes quite long to charge. But since I had some laptop-pull 18650 batteries I thought it might be interesting to replace original batteries with one 18650 and use TP4056 board for charging. Conversion went quite easy. Only thing that motor refused to work when connected to P- so I’ve soldered it to second B- instead. I don’t know why because multimeter was shoving the right voltage. But I’m not that good with electric stuff so can’t tell the reason. Maybe it’s something obvious Anyway, the screwdriver works and charges now.
Just had an email from the supplier. He states that the EN pin does nothing.
Looking at tghe photo of the board it looks like it goes to 2 pind on the chip next to it.
This could be a DW01x chip as pin 1 & 3 on that chip go to a MOSFET gate
So all I got was fake, and all of it has chips have the same logo. And for all of it I asked the seller will they ship genuine items. The answer was yes. Of course they didn’t. Two of them are obviously using the same dropshipping service, because I recived on the same day, 2 identical packages, from different ebay sellers, in identical envelopes, identical packaging inside. Ebay has become pretty useless and unreliable crap. Now I’m supposed to do what, open 3 disputes over 4$ worth of goods, and have endless conversations in chinglish. It’s more the unreliability that annoys me.
sorry to hear that, you have the worst luck with ebay it seems, it would be really hard not to be really pissed off when you asked and they straight up lied to you.
Maybe we should keep a database in the forum with bad ebay sellers………?
spent a bit more time on that $3 purchase, and asked ebay.com to step in, since seller didn’t provide return shipping label (I got non-genuine tp4056 ICs), quote:
_“Since this is an international transaction, eBay cannot force the seller to pay for the return shipping of the item. The rules on the site are geared towards members located in the US since eBay.com is the US core site. In order to return for a full refund, you will need to pay for the shipping out of pocket and then upload the tracking number in the return request.
If the return shipping is more than expected, then I would recommend you continue working with the seller on a partial refund amount on the items.“_
That means ebay buyers protection isn’t worth anything anymore, before very recently when it was not as described you ALWAYS got you money back as long as you could prove it without having to send anything back EVER.
I think i will pay a little more if i find the same item on aliexpress now if i have to, because there it is at least still like that.
I agree, i have a sneaking suspicion of that also, they really hide that option well nowadays, before the resolution center was way more visible and easy to use.
I just filed a claim against a shoddy seller who sold me a flashlight lens that looked nothing like the listing pictures, when i didn’t get a response on the return/refund section of the resolution center i tried to get ebay to step in but couldn’t i only got error messages. But today i got my full refund from the seller it was only 2$ but it is the principle & i am still missing the part i thought i had bought
Some sellers like to give you a hassle in hopes you’ll just go away. They know return shipping back to china with tracking is much more than a lot of items are worth.
Take a picture of the board you received showing the chip markings then send that to the seller along with a copy of the picture in their listing and quote the message you sent prior to sale asking if the item is as pictured. Tell them refund or neg feedback.
Just turned in a request at fasttech for them to carry both the Micro USB charging one…AND the ones w/ the battery protection built on the boards (found a 2x lot at aliexpress for $2.25)
I have used one of those with battery protection for a couple of months, and i have been very satisfied.
But today i accidentally connected a 10440 in backwards and in some hour it sucked my poor little 10440 down to 0,8v when i realized what i had done i disconnected it & it rather quickly recovered to 2.75v & then i started to charge it to see if it was recoverable, but after a bunch of hours on the charger it only got up to 3.08v so i will recycle it.
It doesn’t beak the charger to connect it wrong but it can discharge the battery low enough to break it if you don’t catch it in time
Anyway, the screwdriver works and charges now.