I have a PKCell ICR18650 6600 mAh 3.7V 2A max battery pack. I have tried to charge it using a TP4056 charging module but I've read that it only charges a single cell battery only. Reading the datasheet, it already has BMS circuit in the battery pack. I wonder If what I did when I charged it through the TP4056 damage na BMS inside the battery pack. I want it to charge via micro-usb since I'm using it in my portable Arduino project. Really need some tips and advice. Thank you for your responses!
If it’s 3.7 volts and doesn’t have balancing connections, you should be able to charge it with a single-cell charger, though perhaps rather slowly.
westfw:
If it’s 3.7 volts and doesn’t have balancing connections, you should be able to charge it with a single-cell charger, though perhaps rather slowly.
it does have a BMS inside i guess because it has overcharge, overdischarge features.
grIMAG3:
I want it to charge via micro-usb...
Then that's the limiting factor.
A "3.7volt/6600mA" pack is several cells in parallel, and is seen by the charger as one single cell.
The TP4056 boards I have see were factory set to 1Amp,
and that could be too much for common USB (<=500mA).
Just try,
or mod the TP4056 board to a 0.5Amp charging limit (requires soldering).
The 6.6Ah pack might indeed take a while to charge. (7-14 hours when flat).
Leo..
Wawa:
Just try,
or mod the TP4056 board to a 0.5Amp charging limit (requires soldering).
Okay I'll try that. Be updating my progress in a couple of days.
I have 2 TP4056 charging modules, the first one doesn't heat up that much but when I connect it to a microusb to charge the battery, the voltage for the B+ and B- (battery) using a multimeter it records a 4.2V meaning that it should be already full and the full charge indicator of the charging module would light up but no, it just keeps on charging.But when I remove the batteries from the module, the battery voltage is only 4.0V. The other module heats up like crazy fast. 5seconds after i plugged in the battery and charge it, the module heats up quickly. But when the battery is removed, the module stop heating-up.
So battery voltage is 4.0volt before you connect it to the modules?
Assuming both modules are working correctly...
Could be that one of the modules detects the battery as almost full, and the other one detects it as not yet.
If battery is <= 4.0volt, then the module should charge with the full set current.
That will heat up the chip (a lot), because it's a linear regulator.
(If you plan to lower charging current to ~500mA, you will have less heat.)
If battery voltage gets above 4.0volt, charging current should taper off until it stops charging at 4.2volt.
Make sure the wires between module and battery are short/fat, so the module can sense battery voltage properly.
Leo..
Maybe the TP4056 modules I have are defective? Both doesn't seem to be working as expected. The wires i used are solid jumper wires (not the thin ones though).