It means it will charge a over discharged LiIon cell careful as it is supposed to be.
The reason you can disable it may be because the circuit can also be used as a led driver.
Very nice!
Thank you HKJ!
Is the termination always at 10% of charge current? Hard to see exactly where it is on your 100mA chart.
wkws20 seller: http://www.ebay.com/itm/4-5-9V-1-5A-Lithium-ion-or-iron-phosphate-LiFePO4-charge-module-PCB-18650-A123-/121267753845
Another seller: http://www.ebay.com/itm/4-5-9V-2A-Lithium-ion-or-iron-phosphate-LiFePO4-charge-charging-module-PCB-18650-/181728713087
Yes.
Thank you very much for the test. Does this charger drain the battery empty if it is disconnected from the power source and the battery is still connected?
No: “Discharge with 2uA when not connected to power.”
Could you use this without the LED? If using Solar power wouldn’t the LED take power away from the charger?
Bill
The led do not use much power, but you could leave it out.
In retrospect, seems you complained from a too high of a LiFePO4 charging restart voltage, HKJ.
From what I've observed among some different cell reviews, the actual LiFePO4 resting voltage seems to lie ≈3.4V.
Mmm, digressing a bit off the topic, I was wondering if I could (snugly) fit 3×10440 cells inside a PP3 battery case… 
Cheers fellows ^:)
In parallel setup?
Of course in series, DoubleA.
But you can’t charge those cells in series with that module.
Yes, I can't charge 3S 10440 LiFePO4 cells with these modules, DoubleA; I never said I was going to do such a thing ;-) (off-topic).
Cheers 
Oops, my bad. I thought you were trying to charge multiple cells. 
Hi,
I am new!
I have bought two Sanyo NCR20700B batteries.
I would like to charge the batteries by using TP5000.
What you think, is this module suitable for the battery?
If not could you suggest something else?
Thanks!
It would be great charging at 1A.
Would work quite well with an appropriate 20700 cell holder, and charge in around 4-5 hours, which would be perfect for the cell.
If you can do with 5V of input, TP4056 modules are small, low profile, good and cheap. They were tested by HKJ to charge at 0.85A, can work in parallel from the same input supply (input and output grounds are common), are sold in a variety of charging boards with miniUSB or microUSB input and even basic DW01A + 8205A protection circuitry… and are this 
cheap: https://www.aliexpress.com/item/Free-Shipping-5Pcs-TP4056-Micro-USB-5V-1A-18650-Lithium-Battery-Charger-Board-With-Led-Indicator/32804303644.html
Another alternative is a proper CC/CV module, I have many XL4015 units and they work very nicely for a variety of purposes (fully customizable current and voltage output). Example: https://www.aliexpress.com/item/5A-DC-To-DC-CC-CV-Lithium-Battery-Step-Down-Module-Charging-Board-LED-Power-Converter/32799532951.html
Cheers :-)
great, thank you I will try it out… :+1:
Regarding XL4015, is there any indicator to see whether the battery is fully charged?