Stumbled across this from ICStation
Might help you guys that charge large capacity 25560’s
Looks great, basically it’s just some parallel mounted TP4056 chips.
Yeah, that’s what I thought…interesting though…if one of em fails…
Wow. You're going to have to parallel a bunch of USB power supplies into that thing to get it to output 3A, but it's an interesting concept.
5vdc out from an old ATA powersupply…more than enough current
Well I really like mine. You can get 3amp USB chargers now too
The pictures show real TP4056 chips. The ones that HKJ tested with the stylized “TP” logo. What are the chances that we will actually receive what is pictured?
If the peak current is 3x normal, wouldn’t the cutoff current also be 3x?
Is this a concern?
My understanding is limited, but this is it: Termination is during the constant voltage phase. If a set voltage is being applied, it doesn’t matter how many sources it’s coming from, the voltage is still the same voltage. The battery will only draw a certain amount of current at that set voltage, so the cutoff current will be the same.
Please correct me if I’m wrong.
It would be 4x (4 chips), except cutoff termination voltage varies from one individual chip to another. So the chip with the lowest termination cuts off first, then the next chip, and the next, until only the last chip with the highest termination voltage of the 4 chips remains.
In HKJ’s review of the TP4056 and many other chargers, he marks the termination current with a yellow vertical line.
He later says this about the TP4056 termination current.
So with a 3A charge current, this implies that the termination current is 300mA, which looks high to me. If this is true, it would mean that the charger would stop charging early when the battery is drawing less than 300mA at constant voltage (CV) portion of the charging cycle. So the battery won’t reach 100% charge with this charger.
Because I've never seen two TP4056's that terminate at exactly the same time so I think that the three will terminate at slightly different times thus the last one will terminate at 100ma
That’s a good enough answer for me.
A while back I ordered a bunch of tp4056 boards from different suppliers, this one included, but all of the chips were clones, not a single one was genuine tp4056, even though all sellers responses that they are stocking the genuine one.
That basically happened to me, too, but I think they are ok? I don’t really trust them to terminate at 4.25V (single) though. You kind of have to test them, imo
Still like them. Also, I think my smartphone charger is at least 2A. You might look at that first, if you don’t have a 3A, or are waiting.
This is correct. It can be observed on any dual 4056 or 4057 charger (like XTAR MC1).
NO.
That particular board seems to be using 4 engines with 1’5KΩ current resistors (for about 3A of combined maximum charging current). That doesn’t mean the termination current is 1/10 of 3A! Termination current is 1/10 of the programmed value for each unit: each one terminates at 1/10 of its programmed ratio (which would be about 78mA in this case), albeit at slightly different cut-off voltages. The “charging done” led is attached to only one of the chips, therefore it’ll light up once its particular termination voltage is reached.
BTW, if you are so worried about getting genuine TP4056 chips, I found this one: SC-0176B 1A+2A DIY Dual USB Mobile Power Bank PCB Module board additional product information/relationship
Hope this helps.
Salvador